Complex sentence: A horse harness is a type of horse tack that allows a horse or other equid to pull various horse-drawn vehicles such as a carriage, wagon or sleigh, or other loads such as a plough or canal boat.
Split into simpler sentences: A horse harness is a type of horse tack that allows a horse or other equid to pull various horse-drawn vehicles such as a carriage, wagon or sleigh. Harnesses may also be used to hitch animals to other loads such as a plough or canal boat.