Complex sentence: In Chile, the "Día de las Glorias Navales" is on May 21, Commemorates the Iquique Naval Combat, in may 21 1879 during the Pacific War.
Split into simpler sentences: In Chile, the "Día de las Glorias Navales" is on May 21. It commemorates the Iquique Naval Combat, in may 21 1879 during the Pacific War.