Complex sentence: The result was a triangle, the cylinder banks forming the sides, with crankshafts at each corner connected via phasing gears to a single output shaft-effectively three separate V-12 engines.
Split into simpler sentences: The result was a triangle, the cylinder banks forming the sides, with crankshafts at each corner connected via phasing gears to a single output shaft. With six banks of pistons driving three crankshafts it was effectively three separate V-12 engines.