Complex sentence: He qualified for the 400-metre freestyle final finishing 4th (3:54.15), the 400-metre individual medley finishing 5th (4:26.81), but failed to qualify for the 1500-metre freestyle final.
Split into simpler sentences: He qualified for the 400-metre freestyle final finishing 4th (3:54.15), the 400-metre individual medley finishing 5th (4:26.81). He failed to qualify for the 1500-metre freestyle final.