Complex sentence: However, the discharge of untreated wastewater in non-sewered areas continued and because of inadequate garbage collection and poor maintenance sewers became clogged and overflowed, so that the benefits of the sewerage were less than expected.
Split into simpler sentences: However, the discharge of untreated wastewater in non-sewered areas continued. Because of inadequate garbage collection and poor maintenance sewers became clogged and overflowed, so that the benefits of the sewerage were less than expected.