Complex sentence: Although not seen on all chainsaws, when present chainsaw dogs are mounted where the bar meets the power head, chainsaw dogs provide stability and serve as a sort of fulcrum for swinging the bar through the item being cut.
Split into simpler sentences: Although not seen on all chainsaws, when present chainsaw dogs are mounted where the bar meets the power head. Chainsaw dogs provide stability and serve as a sort of fulcrum for swinging the bar through the item being cut.