Complex sentence: Until 1978 the pope's election was followed in a few days by the Papal coronation, which started with a procession with great pomp and circumstance from the Sistine Chapel to St. Peter's Basilica, with the newly elected pope borne in the "sedia gestatoria".
Split into simpler sentences: Until 1978 the pope's election was followed in a few days by the Papal coronation. A procession with great pomp and circumstance formed from the Sistine Chapel to St. Peter's Basilica, with the newly elected pope borne in the "sedia gestatoria".