Complex sentence: Frohman is drafted into the resistance by Barney Calhoun after failing to disrupt their operations, and unintentionally signals the start of the resistance's uprising by accidentally killing a Combine police officer using one of his Antlions.
Split into simpler sentences: Frohman is drafted into the resistance by Barney Calhoun after failing to disrupt their operations. He unintentionally signals the start of the resistance's uprising after accidentally killing a Combine police officer using one of his Antlions.