Complex sentence: In 1922 he became manager of Southend United and spent 12 seasons in charge of the club, becoming the only manager to preside over a Southend team for more than 500 matches (April 2009).
Split into simpler sentences: In 1922 he became manager of Southend United and spent 12 seasons in charge of the club. Becoming the only manager to preside over a Southend team for more than 500 matches (April 2009).