Complex sentence: In the 2012-2013 season he was part of the Miami Heat team that went on a 27 game winning streak that challenged for the all time regular season winning streak record of 33 set by the 1971-1972 Lakers.
Split into simpler sentences: In the 2012-2013 season they went on a 27 game winning streak. The streak challenged for the all time regular season winning streak record of 33 set by the 1971-1972 Lakers.