Complex sentence: This became popular in the early 1960s, when a guide-rail system was developed to lift the submersible pump out of the pump station for repair, and ended the dirty and sometimes dangerous task of sending people into the sewage or wet pit.
Split into simpler sentences: This became popular in the early 1960s, when a guide-rail system was developed to lift the submersible pump out of the pump station for repair. This ended the dirty and sometimes dangerous task of sending people into the sewage or wet pit.