Complex sentence: One of baseball's "boy managers", Harris both played for and managed the Senators beginning in 1924, directing the team to a World Series Championship in his rookie season and the AL pennant the following year.
Split into simpler sentences: One of baseball's "boy managers", Harris both played for and managed the Senators beginning in 1924. Harris directed the team to a World Series Championship in his rookie season and the AL pennant the following year.