Complex sentence: William Thomas Mainwaring, known as Billy, (born 24 January 1941 in Port Talbot) was a Welsh international second row rugby union player who played for Aberavon RFC.
Split into simpler sentences: William Thomas Mainwaring known as Billy (born 24 January 1941) in Port Talbot. Billy Mainwaring was a Welsh international second row rugby union player who played for Aberavon RFC.