Complex sentence: Wide whitewalls generally fell out of favor in the U.S. by the 1962 model year, they continued as an option on the Lincoln Continental for some time thereafter but most common were the 1 "-3/4" stripe whitewalls.
Split into simpler sentences: Wide whitewalls generally fell out of favor in the US by the 1962 model year. They continued as an option on the Lincoln Continental for some time thereafter but most common were the 1 "-3/4" stripe whitewalls.