in 1922, ralph became a proctor at cambridge which, being a marine, he was well-suited for, finding himself chasing after undergraduates frequently and, on one occasion, injuring himself doing so.

How would the previous sentence be correctly capitalized?
In 1922, Ralph became a Proctor at Cambridge which, being a Marine, he was well-suited for, finding himself chasing after undergraduates frequently and, on one occasion, injuring himself doing so.