Complex sentence: There is a bigger problem between the rivalry of Caxton and the American School Of Valencia, where there are large groups of pupils of each school fight each other, often weapons are bought along, and once there was use of a gun.
Split into simpler sentences: There is a bigger problem between the rivalry of Caxton and the American School Of Valencia, where there are large groups of pupils of each school fight each other. Often weapons are bought along, and once there was use of a gun.