Complex sentence: The next year, at the US Olympic Trials for the Barcelona Olympics, Marsh, who had posted a sub- 10-second time that season, disappointingly finished fourth in the 100 m, not enough for individual qualification, but sufficient to make the relay team.
Split into simpler sentences: The next year, at the US Olympic Trials for the Barcelona Olympics, Marsh, who had posted a sub- 10-second time that season, disappointingly finished fourth in the 100 meters. Not enough for individual qualification, but sufficient to make the relay team.