Complex sentence: The Railway Department had agreed to supply electricity to the Blue Mountains Shire Council from the power station at Lithgow, and a transmission line was put through from Blackheath to Lawson, with a track to provide maintenance access.
Split into simpler sentences: The Railway Department had agreed to supply electricity to the Blue Mountains Shire Council from the power station at Lithgow. A transmission line was put through fropm Blackheath to Lawson, with a track to provide maintenance access.