Complex sentence: On May 13,2012, Gómez was called up to the Red Sox whenDarnell McDonald went on the disabled list, and after Jacoby Ellsbury was moved to the 60-day disabled list.
Split into simpler sentences: On May 13,2012, Gómez was called up to the Red Sox. He filled the roster spot of Darnell McDonald, who went on the disabled list and added after Jacoby Ellsbury was moved to the 60-day disabled list.