Complex sentence: Contrary to her Silver, Golden and Diamond Jubilees, there were not widespread public celebrations of the Sapphire Jubilee, like the 1992 Ruby Jubilee, and the Queen did not undertake any official engagements.
Split into simpler sentences: Contrary to her Silver, Golden and Diamond Jubilees, there were not widespread public celebrations of the Sapphire Jubilee. Instead, like the February 1992 Ruby Jubilee, the Queen did not undertake any official engagements.