Complex sentence: A fleet of 115 eight and twelve carriage trains are expected to enter service between 2016 and 2018; in addition new rolling stock depots are to be constructed at Hornsey and Three Bridges.
Split into simpler sentences: A fleet of 115 eight and twelve carriage trains are expected to enter service between 2016 and 2018. Associated rolling stock depots are to be constructed at Hornsey and Three Bridges.