Complex sentence: The first five games (1997--2001) were played at the Pontiac Silverdome in Pontiac, Michigan, and moved to the 65,000-seat Ford Field in downtown Detroit, Michigan in 2012--both the past and present homes of the Detroit Lions.
Split into simpler sentences: The first five games (1997--2001) were played at the Pontiac Silverdome in Pontiac, Michigan. Starting in 2002, the game was moved to 65,000-seat Ford Field in downtown Detroit, Michigan--both of which were the past and present homes of the Detroit Lions.