Complex sentence: By 1992, the standard square sealed beam glass headlamps were phased out for the aerodynamic style molded plastic headlamps attached to the grill surround and equipped with halogen lights making 1991 being the only year for a unique front end for the Dakota.
Split into simpler sentences: By 1992, the standard square sealed beam glass headlamps were phased out for the aerodynamic style molded plastic headlamps attached to the grill components. It was equipped with halogen lights, making 1991 the only year for a unique front-end for the Dakota.