Complex sentence: Bob spent nine years in charge at Portsmouth from 1911 to 1920 before taking charge at Sheffield Wednesday where he guided his club to promotion to the First Division in 1925 and then on to consecutive league titles in 1929 and 1930.
Split into simpler sentences: Bob spent nine years in charge at Portsmouth from 1911 to 1920. He guided his club to promotion to the First Division in 1925 and then on to consecutive league titles in 1929 and 1930.