Complex sentence: They board a bus and take the back seat, elated at their victory however in the final shot, Benjamin's smile gradually fades to an enigmatic, neutral expression as he gazes forward down the bus, not looking at Elaine.
Split into simpler sentences: They board a bus and take the back seat, elated at their victory. However, in the final shot, Benjamin's smile gradually fades to an enigmatic, neutral expression as he gazes forward down the bus, not looking at Elaine.