Complex sentence: Calvin and his girlfriend Maggie (Danielle Nicolet) are the only two that refrain from laughing; he immediately takes off his jacket and gives it to Robbie, who thanks him and leaves in embarrassment.
Split into simpler sentences: Calvin and his girlfriend Maggie (Danielle Nicolet) are the only ones not laughing. Calvin takes off his jacket and gives it to Robbie, who thanks him and leaves in embarrassment.