Complex sentence: The Turtles later face Shredder as the final boss, as in the arcade game; however, in the SNES and SMD/SG versions of the game, Shredder mutates himself into Super-Shredder before the battle.
Split into simpler sentences: The Turtles later face Shredder as the final boss, as in the arcade game. However, in the SNES and SMD/SG versions of the game, Shredder mutates himself into Super-Shredder before the battle.