Complex sentence: After the move of the capital, the Baekje power structure fell into chaos when the traditional Buyeo-descended aristocracy clashed with the local Mahan-based clans; rivalry within the old aristocracy, suppressed by previous powerful kings, resurfaced.
Split into simpler sentences: After the move of the capital, Baekje power structure fell into chaos as the traditional Buyeo-descended aristocracy clashed with the local Mahan-based clans. Rivalry even within the old aristoracy, suppressed by previous powerful kings, resurfaced.