Complex sentence: Law 9 of the Laws of Cricket governs the size and position of the crease markings, and defines the actual line as the back edge of the width of the marked line on the grass, i.e., the edge nearest to the wicket at that end.
Split into simpler sentences: Law 9 of the Laws of Cricket governs the size and position of the crease markings. The actual line is considered to be the back edge of the width of the marked line on the grass, i.e., the edge nearest to the wicket at that end.