Complex sentence: Jefferies left Berwick in 1983 to become a manager at East of Scotland Football League club Gala Fairydean, but returned to the club to begin his senior managerial career in September 1988.
Split into simpler sentences: Jefferies left Berwick in 1983 to become a manager at East of Scotland Football League club Gala Fairydean. Jefferies returned to the Wee Gers to begin his senior managerial career in September 1988.