Complex sentence: He broke his own indoor world record on February 17,1934 with a jump of 14 ft 4 in (4.37 m), again at Madison Square Garden; that summer he repeated as both IC4A champion and national outdoor champion.
Split into simpler sentences: He broke his own indoor world record on February 17,1934, with a jump of 14 ft 4 in (4.37 m), again at Madison Square Garden. That summer he repeated as both IC4A champion and national outdoor champion.