Complex sentence: In 2004 the 0.8/1.0 engines were again updated with new intake/excaust systems and low-friction aluminum cam followers with rollers, resulting in better economy.
Split into simpler sentences: In 2004 the 0.8/1.0 engines were again updated. New intake and exhaust systems, along with low-friction aluminum cam followers with rollers, were added, resulting in better economy.