Complex sentence: It is often used as a construction or handymans marking tool as it rarely scratches the surface it is used on, it may be used to mark a wet surface and because it is sharpened by pulling a string so it needs no additional tools to remain functional.
Split into simpler sentences: It is often used as a construction or handymans marking tool as it rarely scratches the surface it is used on, it may be used to mark a wet surface. Because it is sharpened by pulling a string so it needs no additional tools to remain functional.