Complex sentence: Sagan was the quickest in the final metres, but he had started too far back; although he was able to pass Stybar to finish second on the stage, he was unable to catch Van Avermaet.
Split into simpler sentences: Sagan was the quickest in the final metres, but he had started too far back. Although he was able to pass Stybar to finish second on the stage, he was unable to catch Van Avermaet.