Complex sentence: In many ways Rolf was the first true Headmaster of St Peters and it was in 1934 that Pat Knox-Shaw, who had joined the school in 1919 as second master, took over the reins as Headmaster on Rolf Henderson's retirement.
Split into simpler sentences: In many ways Rolf was the first true Headmaster of St Peters. In 1934 Pat Knox-Shaw, who had joined the school in 1919 as second master, took over the reins as Headmaster on Rolf Henderson's retirement.