Complex sentence: The 110-series remains in production and has been continually updated over the years-for example, engines used to be 1.5 L units with either 8 or 16 valves, but these have now been upgraded to 1.6 L units that meet stricter emissions rules.
Split into simpler sentences: The 110-series remains in production and has been continually updated over the years. For example, engines used to be 1.5 L units with either 8 or 16 valves, but these have now been upgraded to 1.6 L units that meet stricter emissions rules.