Complex sentence: Rienzo began 2013 with Charlotte, where he went 8-6 in 20 starts with a 4.06 ERA before being recalled on July 30 by the White Sox to make a spot start for Jake Peavy, who was scratched amid trade rumors.
Split into simpler sentences: Rienzo began 2013 with Charlotte, where he went 8-6 in 20 starts with a 4.06 ERA before being recalled. On July 30, Rienzo was recalled by the White Sox to make a spot start for Jake Peavy, who was scratched amid trade rumors.