Complex sentence: His landed acquisitions were added to those of his uncle, and the merger effected due to an absence of any surviving male successor of Hafizullah, consequently made the united zamindari one of the biggest in the province.
Split into simpler sentences: His landed acquisitions were added to those of his uncle, Hafizullah. The merger, which was effected due to an absence of any surviving male successor of Hafizullah, consequently made the united zamindari one of the biggest in the province.