Complex sentence: Taylor gets a charmed Indian lance into Steve's hands, and Steve successfully defeats the Beast/Kane with it, causin it to fall into the afterlife, finally crossing over which crosses over all of the spirits he has trapped.
Split into simpler sentences: Taylor gets a charmed Indian lance into Steve's hands, and Steve successfully defeats the Beast/Kane with it. He falls into the afterlife, finally crossing over which crosses over all of the spirits he has trapped.