Complex sentence: Born in Bagillt, Flintshire, Wales, Lambert joined the Reds as an amatuer schoolboy in 1936 aged 13, in doing so Ray set the record for being the youngest ever player to join a league side.
Split into simpler sentences: Born in Bagillt, Flintshire, Wales, Lambert joined the Reds as an amateur schoolboy in 1936 aged 13. In doing so, he set the record for being the youngest ever player to join a league side.