Complex sentence: Along with the base-trim Capri, Mercury offered the Capri Ghia (shared with the Mustang), Capri GS, Capri RS, and Capri Turbo RS; the Capri RS was the Capri equivalent of a Mustang GT.
Split into simpler sentences: Along with the base-trim Capri, Mercury offered the Capri Ghia (shared with the Mustang), Capri GS, Capri RS, and Capri Turbo RS. The Capri RS was the Capri equivalent of a Mustang GT.