Complex sentence: Erin discovers they have kidnapped a child when she sees that the baby with them is the same child in a photograph with the hitchhiker; however, the tea is drugged and she passes out before she can leave the trailer.
Split into simpler sentences: Erin discovers they have kidnapped a child when she sees that the baby with them is the same child in a photograph with the hitchhiker. However, the tea is drugged and she passes out before she can leave the trailer.