Complex sentence: The Battle of Surabaya, one of the most important battles of the Indonesian revolution, started after the killing of the British Brigadier Mallaby on October 30,1945 near "Jembatan Merah" (the "Red Bridge"), allegedly by a stray bullet.
Split into simpler sentences: The Battle of Surabaya was one of the most important battles of the Indonesian revolution. It was started after British Brigadier Mallaby was killed on October 30,1945 near "Jembatan Merah" (the "Red Bridge"), allegedly by a stray bullet.