Complex sentence: He began his professional career in 2008 with the Class A short-season Lowell Spinners, appearing in eight games, making seven starts, with an ERA of 4.28 in 33.2 innings.
Split into simpler sentences: He began his professional career in 2008 with the Class A short-season Lowell Spinners. He appeared in eight games, making seven starts, and recored an ERA of 4.28 over 33.2 innings.