Complex sentence: As Olsen (2006) shows, after Pike's death in battle, his military accomplishments were widely celebrated in terms of biographies, mourning memorials, paintings, poems, and songs, and he became the namesake for dozens of towns, counties, and ships.
Split into simpler sentences: As Olsen (2006) shows, after his death in battle, Pike's military accomplishments were widely celebrated in terms of mourning memorials, paintings, poems and songs, as well as biographies. He became the namesake for dozens of towns, counties, and ships.