Complex sentence: However, in recent decades production tolerances for many parts have been trending downward, and production-run tolerance ranges of 2 tenths are no longer rare, and tolerances for gauge blocks or pins, can go as low as 0.2 tenths for the most expensive class.
Split into simpler sentences: However, in recent decades production tolerances for many parts have been trending downward, and production-run tolerance ranges of 2 tenths are no longer rare. Gagemakers' tolerances, such as for gauge blocks or pins, can go as low as 0.2 tenths for the most expensive class.