Complex sentence: A fleet of 60 eight-and 55 twelve-car trains is expected to enter service between spring 2016 and 2018; the first unit is planned to be introduced on 16 April 2016.
Split into simpler sentences: A fleet of 60 eight-and 55 twelve-car trains are expected to enter service between spring 2016 and 2018. The first unit is planned to be introduced on 16 April 2016.