Complex sentence: Defeating Nemesis, she realizes he is Matt Addison, her friend and one of the survivors in The Hive, as he was infected by a Licker from the first film as he started to mutate and was placed in the program.
Split into simpler sentences: Defeating Nemesis, she realizes he is Matt Addison, her friend and one of the survivors in The Hive. As he was infected by a Licker from the first film and he started to mutate, he was placed in the program.