Complex sentence: This use was steadily extended, and trains had to make a number of changes between traction current supplies during their short journey; these were at Hackney Wick, Dalston Kingsland, Camden Road and Acton Central.
Split into simpler sentences: This use was steadily extended and trains had to make a number of changes between traction current supplies during their short journey. These were at Hackney Wick, Dalston Kingsland, Camden Road and Acton Central.