Complex sentence: Colossus currently stands where the Pet-A-Pet petting zoo once was; the zoo was removed in 1985 to make remove for the 1986 addition of Colossus.
Split into simpler sentences: Colossus currently stands where Pet-A-Pet petting zoo once stood. The Pet-A-Pet petting zoo was removed in 1985 to make remove for the 1986 addition of Colossus.