Complex sentence: The rebellion became more dangerous when the towns joined on the side of the peasants, and in Buda and other places the cavalry sent against the "Kuruc" were unhorsed as they passed through the gates.
Split into simpler sentences: The rebellion became more dangerous when the towns joined on the side of the peasants. In Buda and elsewhere, the cavalry sent against the "Kuruc" were unhorsed as they passed through the gates.