Complex sentence: During the game, however, Chris finds information suggesting that she may still be alive, and discovers she is under Wesker's control, Wesker having used Jill's DNA and the remnants of the T-virus within her body to perfect his new Uroboros virus.
Split into simpler sentences: During the game, however, Chris finds information suggesting that she may still be alive. Eventually, he discovers that Jill is under control of Wesker, who used Jill's DNA and the remnants of the T-virus within her body to perfect his new Uroboros virus.