Complex sentence: Lampugnani, descended from Milanese nobility is recognized as the leader of the conspiracy, his motives based primarily on a land dispute, in which Galeazzo failed to intervene in a matter which saw the Lampugnani family lose considerable properties.
Split into simpler sentences: Lampugnani, descended from Milanese nobility, is recognized as the leader of the conspiracy. His motives were based primarily on a land dispute, in which Galeazzo had failed to intervene in a matter which saw the Lampugnani family lose considerable properties.