Complex sentence: In November 1919 he signed for professional club Gillingham, at the time playing in the Southern Football League, but had to wait until the following April to make his debut for the team, which came in an away match against Southend United.
Split into simpler sentences: In November 1919 he signed for professional club Gillingham, at the time playing in the Southern Football League. He had to wait until the following April to make his debut for the team, which came in an away match against Southend United.