Complex sentence: By 1907 the middle circle had been replaced by four Hammersmith & City line trains an hour and the station appears on the first'London Underground' map in 1908 with Metropolitan and District Railway services.
Split into simpler sentences: By 1907 the middle circle had been replaced by four Hammersmith & City line trains an hour. The station appears on the first'London Underground' map in 1908 with Metropolitan and District Railway services.