Complex sentence: However the GNR refused permission for trains to use its Finsbury Park station, so platforms were built beneath the station instead and public service on the line, using electric multiple units, began in 1904.
Split into simpler sentences: However the GNR later refused permission for trains to use its Finsbury Park station, and platforms were built beneath the station instead. Public service on the line, using electric multiple units, began in 1904.