Complex sentence: Meanwhile, Jim agrees to a snowball fight with Dwight Schrute (Rainn Wilson), but when he is first challenged outside, he eventually finds the doors chained and Dwight emerging from a snowman, throwing multiple snowballs at him and leaving him with a bloody nose.
Split into simpler sentences: Meanwhile, Jim agrees to a snowball fight with Dwight Schrute (Rainn Wilson). Dwight then emerges from a snowman, throwing multiple snowballs at Jim and leaving him with a bloody nose.