Complex sentence: Behind Clemens, the Astros were closing in on their first-ever postseason series win, but Clemens left the game in favor of Chad Qualls, who gave up a three-run homer to Adam LaRoche to tie the game in the sixth.
Split into simpler sentences: Behind Clemens, the Astros were closing in on their first ever postseason series win. But Clemens left the game in favor of Chad Qualls, who gave up a three-run homer to Adam LaRoche to tie the game in the sixth.