Complex sentence: David Geoffrey Bles (1886--1957) was a British publisher, with a reputation for spotting new talent, who started his eponymous publishing firm in London in 1923, and published the first five books of C.S. Lewis' "Narnia" series.
Split into simpler sentences: David Geoffrey Bles (1886--1957) was a British publisher, with a reputation for spotting new talent. He started his eponymous publishing firm in London in 1923 and published the first five books of C.S. Lewis' "Narnia" series.