Complex sentence: The noble families retained some power as the guilds became part of the town council, however in 1459 the last noble family died out and positions on the council fell to wealthy farmers, butchers and millers.
Split into simpler sentences: The noble families retained some power as the guilds became part of the town council. However in 1459 the last noble family died out and positions on the council fell to wealthy farmers, butchers and millers.