Complex sentence: Therefore, in the spring of 1859 Robert Dyer and his family left Greenspond and on 7 July 1859, they sailed for Prince Edward Island where he was to serve until 1884.
Split into simpler sentences: Therefore, in the spring of 1859 Robert Dyer and his family left Greenspond. On 7 July 1859, they sailed for Prince Edward Island, where he was to serve until 1884.