Complex sentence: However, he was called up to the Expos in May, and he appeared in his first game with them in 2000 on May 20, giving up one run in one inning in an 8--7 victory over the Houston Astros.
Split into simpler sentences: However, he was called up to the Expos in May. On May 20, his first game of the season with them, he gave up one run in one inning in an 8--7 victory over the Houston Astros.