Complex sentence: He did not appear for the Giants in 2011, spending the season with the Grizzlies until he injured his shoulder diving for a ball early in the year and underwent season-ending shoulder surgery in the summer of 2011.
Split into simpler sentences: He did not appear for the Giants in 2011, spending most of the season with the Grizzlies. However, he injured his shoulder diving for a ball early in the year and underwent season-ending shoulder surgery in the summer of 2011.