Complex sentence: Ellsbury was named MLB's American League Rookie of the Month for September 2007 and, with fewer than 130 major league at-bats, he still qualified as a rookie for the 2008 season.
Split into simpler sentences: Ellsbury was named MLB's American League Rookie of the Month for September 2007. With fewer than 130 major league at-bats, he still qualified as a rookie for the 2008 season.