Complex sentence: Needing a birdie to tie, Nicklaus bogeyed the final hole, one of 19 times in his career that he was the runner-up in a major championship.
Split into simpler sentences: Needing a birdie to tie, Nicklaus bogeyed the final hole. It was one of the 19 times in Nicklaus's career that he was the runner-up in a major championship.