Complex sentence: The original school anthem was "Hail Ateneo, Hail", a marching tune, but upon moving to Loyola Heights in the 1950s, the school adopted "A Song for Mary" as its graduation hymn and is now widely considered the school's anthem.
Split into simpler sentences: The original school anthem was "Hail Ateneo, Hail", a marching tune. Upon moving to Loyola Heights in the 1950s, the school adopted "A Song for Mary" as its graduation hymn and is now widely considered the school's anthem.