Complex sentence: His success at the 1972 Summer Olympics was overshadowed by the terrorist actions that took place days before, this and other things contributed to the fact that he has not become as famous as his compatriot Anton Geesink.
Split into simpler sentences: His success at the 1972 Summer Olympics was overshadowed by the terrorist actions that took place days before. This and other things contributed to the fact that he has not become as famous as his compatriot Anton Geesink.