Complex sentence: Duesenberg (often nicknamed "Duesy") was originally an Auburn, Indiana based American luxury automobile company active in various forms from 1913 to 1937, most famous for its high-quality passenger cars and record-breaking racing cars.
Split into simpler sentences: Duesenberg (often nicknamed "Duesy") was originally an American luxury automobile company. It was most famous for its high-quality passenger cars and record-breaking racing cars.