Complex sentence: In the 1970s, A Goninan & Co in Newcastle entered the passenger car construction market building 80 power cars C3001--3080 and 70 trailer cars T4101--4170.
Split into simpler sentences: In the 1970s, A Goninan and Co in Newcastle entered the passenger car construction market. In 1978, Goninan built 80 power cars C3001--3080 and 70 trailer cars T4101--4170.