Complex sentence: In 1865, Hearst bought all Rancho Santa Rosa except from Estrada; however Estrada did not have the right to sell this land, as Pujol was in the process of foreclosing on it.
Split into simpler sentences: In 1865, Hearst bought all Rancho Santa Rosa except from Estrada. However Estrada did not have the right to sell this land, as Pujol was in the process of foreclosing on it.