Complex sentence: Rayner joined his first club, East Bradford CC, at the age of 12 in 1979, he then joined the Bradford Wheelers in 1984, and won the National Junior Road Race Championships at Stoke on Trent.
Split into simpler sentences: Rayner joined his first club, East Bradford CC, at 12 in 1979. He, he then joined the Bradford Wheelers in 1984, and won the National Junior Road Race Championships at Stoke on Trent.