Complex sentence: Once inside the city walls the Qarmatian army set about massacring the pilgrims, taunting them with verses of the Koran as they did so The bodies of the pilgrims were left to rot in the streets or thrown down the Well of Zamzam.
Split into simpler sentences: Once inside the city walls the Qarmatian army set about massacring the pilgrims, taunting them with verses of the Koran as they did so. The Rise of the Fatimids Brill, p.255-6 The bodies of the pilgrims were left to rot in the streets or thrown down the Well of Zamzam.