Complex sentence: A district is governed by a District Collector, who is better known as a District Magistrate (DM) in the state of West Bengal, is either an IAS officer or a WBCS officer.
Split into simpler sentences: A district is governed by a District Collector, who is better known as a District Magistrate (DM) in the state of West Bengal. DM is either an IAS officer or a WBCS officer.