Complex sentence: Although Hershiser completed the ninth inning in each start, since the final game went 16 innings of which Hershiser only pitched ten, Hershiser did not match Drysdale's record of 6 consecutive complete game shutouts.
Split into simpler sentences: Although Hershiser completed the ninth inning in each start during the streak, the final game went 16 innings of which Hershiser only pitched ten. Thus, Hershiser did not match Drysdale's record of 6 consecutive complete game shutouts.