Complex sentence: Two models were made in the late seventies, the Safari, which had most of the bodywork changed, and the Sahara and the Safari, which featured more limited changes, ie. changed grill and tuned up the interior.
Split into simpler sentences: Two models were made in the late seventies, the Sahara and the Safari. On one model most of the bodywork was changed, whereas the modifications on the other were more limited, ie. changed grill and tuned up the interior.