Complex sentence: Cotton laces have a rough surface and will make a more reliable knot compared to polyester (the most common yarn used in shoelaces), in addition a lace can be smooth or have a coarse surface which will also affect performance.
Split into simpler sentences: Cotton laces have a rough surface and will make a more reliable knot compared to polyester (the most common yarn used in shoelaces). In addition, a lace can be smooth or have a coarse surface, which will also affect performance.