Complex sentence: On July 26,2008 at approximately 8pm, a fight broke out on the mall's upper level involving approximately a dozen teenagers and inciting upwards of 150 + other teens to act out.
Split into simpler sentences: On July 26,2008 at approximately 8pm, a fight broke out on the mall's upper level. The fight involved approximately one dozen teenagers and incited upwards of 150 other teens to act out.