Simplify the following text for a Grade 9 native English-speaking person.
Original: 1500 c and 1600 c units were developed in 1963 for use in Formula B and sports car racing , as well as for powering the Lotus Cortina .
Simplified: 1500 c and 1600 c engines were were built use in Formula B , sports car racing , and the Lotus Cortina .