Complex sentence: Arguably, Bruch's greatest successes were Olympic bronze in 1972 along with silver and bronze at the European Championships in Athletics, but he also managed to equal the world record in 1972 with a throw of 68.40 metres.
Split into simpler sentences: Arguably, Bruch's greatest successes were Olympic bronze in 1972 along with silver and bronze at the European Championships in Athletics. Bruch equaled the world record in 1972 with a throw of 68.40 metres.