Complex sentence: The pumping station underwent several changes, including revising the wheel into two sections each wide with a gap between them during its operation up until 1952 when its maintenance and repair become uneconomic in the light of falling traffic on the canal.
Split into simpler sentences: The pumping station underwent several changes, including revising the wheel into two sections each wide with a gap between them, during its operational life which ended in 1952. Its maintenance and repair then become uneconomic in the light of falling traffic on the canal.