Complex sentence: Like Ian, Erin is very skeptical and sarcastic, unbeknownst to them, a stack of supplies falls on to the gear shift of a forklift, which begins to follow them.
Split into simpler sentences: Like Ian, Erin is very skeptical and sarcastic. Unbeknownst to them, a stack of supplies falls on to the gear shift of a forklift, which begins to follow them.