Complex sentence: Boeing announced a new version of the 747 in October 1985, the 747-400 introduced in 1989, with an extended range and capacity, using a combination of winglets and increased span to carry the additional load.
Split into simpler sentences: Boeing announced a new version of the 747 in October 1985, known as the 747-400, with an extended range and capacity. With that particular model, Boeing used a combination of winglets and increased span to carry the additional load.