Complex sentence: It is stored in the Novaliches Reservoir and filtered in the La Mesa Dam, both in northeast Quezon City, while water distribution and sewerage system used to be managed by the Metropolitan Water and Sewerage System (MWSS), a state-owned company.
Split into simpler sentences: It is stored in the Novaliches Reservoir and filtered in the La Mesa Dam, both in northeast Quezon City. Metro Manila's water distribution and sewerage system used to be managed by the Metropolitan Water and Sewerage System (MWSS), a state-owned company.