Complex sentence: They were timed to precede the G8 conference and summit held at the Gleneagles Hotel in Auchterarder, Scotland from 6--8 July 2005; they also coincided with the 20th anniversary of Live Aid.
Split into simpler sentences: They were timed to precede the G8 conference and summit held at the Gleneagles Hotel in Auchterarder, Scotland from 6--8 July 2005. Both events also coincided with the 20th anniversary of Live Aid.