Complex sentence: There are many similarly designed cutting implements that have the traditional sabre saw's qualities but are not known to be sabre saw's, these include the keyhole saw, and some Japanese varieties of woodwoorking tools, e.g., the kataba saw.
Split into simpler sentences: There are many similarly designed cutting implements that have the traditional sabre saw's qualities but are not known to be sabre saws. These include the keyhole saw, and some Japanese varieties of woodwoorking tools, e.g., the kataba saw.