Question: What was triggered by the resignation of Conservative MP Stephen Phillips on 4 November 2016 and was when Caroline Johnson became a Member of Parliament?

Passages:
The Chester by-election of 1916 was held on 29 February 1916.  The by-election was held due to the resignation of the incumbent Conservative MP, Robert Yerburgh.  It was won by the Conservative candidate Sir Owen Philipps, who had previously been a Liberal MP.  Phillips was unopposed. The Sleaford and North Hykeham by-election was a by-election in England for the House of Commons constituency of Sleaford and North Hykeham held on 8 December 2016.  It was triggered by the resignation of Conservative MP Stephen Phillips on 4 November 2016.  It was the first by-election to be contested in Lincolnshire since the Lincoln by-election of 1973 which by coincidence back then also saw the UK's relationship with Europe being a major issue. Caroline Elizabeth Johnson (born 1978) is a British Conservative Party politician and consultant paediatrician.  She has been the Member of Parliament (MP) for Sleaford and North Hykeham since the by-election there on 8 December 2016. Ross Thomson (born 21 September 1987) is a Scottish Conservative Party politician who has been the Member of Parliament (MP) for Aberdeen South since 8 June 2017.  Thomson is the first Conservative MP elected for Aberdeen South since the 1992 general election.  He was Member of the Scottish Parliament (MSP) for the North East Scotland region from May 2016 until June 2017. Tory Boy was a character in a television sketch by comedian Harry Enfield which portrayed a young, male, Conservative MP.  The term has since been used as a caricature of young Conservative MPs.  Tory Boy was a repulsive thirteen-year-old, combining the characteristics of a snobbish, unpopular boy who went to school with Enfield, and those of an imagined younger version of William Hague.  Enfield also claimed to have mixed other recent Conservative politicians such as Michael Howard and Michael Portillo into the character, alleging that they were "Tory Boys who have never grown up."  The traits of "Tory Boy" have also been said to mirror those of a stereotypical member of the Federation of Conservative Students.  The Tory Boy image of a young Conservative MP has damaged some politicians.  William Hague struggled to shake off the stereotype and was often ridiculed for it during his leadership of the party.  Recently it has been argued that Conservative Future has managed to change the image of young Conservatives from that given by the FCS. Thangam Rachel Debbonaire (born 3 August 1966) is a British Labour Party politician.  Debbonaire was a professional cellist and has also worked as National Research Manager for domestic violence charity Respect.  She became Member of Parliament (MP) for Bristol West at the 2015 General Election, when she defeated the incumbent Liberal Democrat MP Stephen Williams.  Shortly after winning Bristol West, Debbonaire was diagnosed with breast cancer, and did not attend a Parliamentary vote from June 2015 until March 2016. Stephen James Phillips (born 9 March 1970) is a British Conservative Party politician, barrister and recorder (part-time Crown Court judge).  He represented the constituency of Sleaford and North Hykeham as its Member of Parliament (MP) from 2010 until his resignation.  On 4 November 2016, he announced that he was standing down with immediate effect, owing to his irreconcilable policy differences with the government. The 1954 Sutton and Cheam by-election was held on 4 November 1954 due to the resignation of the Conservative MP Sydney Marshall.  The seat was retained by the Conservative candidate Richard Sharples. Sir Alan Gordon Barraclough Haselhurst {'1': ", '2': ", '3': ", '4': "} (born 23 June 1937) is a British Conservative politician who served as Member of Parliament (MP) for Saffron Walden from 1977 to 2017, having represented Middleton and Prestwich as MP from 1970 to 1974.  He was Chairman of Ways and Means from 14 May 1997 to 8 June 2010, and later Chairman of the Commonwealth Parliamentary Association between 2011 and 2014.  He was the oldest Conservative MP during his last Parliament, and stood down at the 2017 general election. Sandra Julia Gidley (née Rawson; born 26 March 1957) is a Liberal Democrat politician in the United Kingdom.  She was the Member of Parliament (MP) for Romsey in Hampshire from 2000 to 2010, when she lost her seat to Conservative MP Caroline Nokes.

Supporting sentences:
 She has been the Member of Parliament (MP) for Sleaford and North Hykeham since the by-election there on 8 December 2016. The Sleaford and North Hykeham by-election was a by-election in England for the House of Commons constituency of Sleaford and North Hykeham held on 8 December 2016.  It was triggered by the resignation of Conservative MP Stephen Phillips on 4 November 2016.