Complex sentence: The standard engine was a new 140-horsepower 305 V8 with optional engines including the 145-horsepower 350 two-barrel V8 and 180-horsepower 400 four-barrel V8.
Split into simpler sentences: The standard engine was a new 140-horsepower 305 V8. Optional engines included the 145-horsepower 350 two-barrel V8 and 180-horsepower 400 four-barrel V8.