Complex sentence: The 1978 model year brought a minor restyling including rectangular headlamps and revised taillights, as well as more aerodynamic "bullet" style side mirrors, features which continued through the end of first-generation Granada/Monarch production in 1980.
Split into simpler sentences: The 1978 model year brought a minor restyling for the Granada; this included rectangular headlamps and revised taillights as well as more aerodynamic "bullet" style side mirrors. These features continued through the end of first-generation Granada/Monarch production in 1980.