Complex sentence: The members of the Petrović clan ignored this in order to keep political power within their family and, thus, they dressed Rade in Petar I's cassock and proceeded to have him ordained as an Archimandrite before any further theological objections could be raised.
Split into simpler sentences: The members of the Petrović clan ignored this in order to keep political power within their family. Subsequently, they dressed Rade in Petar I's cassock and proceeded to have him ordained as an Archimandrite before any further theological objections could be raised.