Complex sentence: The screws are usually inserted into an edgde on the long grain side of one member and extend through the joint into the end grain of the adjacent dthis reason, long screws are required (usually 3 times the thickness of the member) to ensure good traction.
Split into simpler sentences: The screws are usually inserted into an edge on the long grain side of one member and extend through the joint into the end grain of the adjacent member. For this reason, long screws are required (usually 3 times the thickness of the member) to ensure good traction.