Complex sentence: Passianos and Melus met on the Fortore at Arenula; the battle was either indecisive (William of Apulia) or a victory for Melus (Leo of Ostia and Amatus).
Split into simpler sentences: Passianos and Melus met on the Fortore at Arenula. The battle was either indecisive (William of Apulia) or a victory for Melus (Leo of Ostia and Amatus).