Complex sentence: Dudley Ward rowed for Cambridge in the Boat Race in 1897, when Oxford won and as President of Cambridge University Boat Club (CUBC) he rowed in the winning Cambridge crews in the 1899 and 1900 Boat Races.
Split into simpler sentences: Dudley Ward rowed for Cambridge in the Boat Race in 1897, when Oxford won. As President of Cambridge University Boat Club (CUBC), he rowed in the winning Cambridge crews in the 1899 and 1900 Boat Races.