Complex sentence: This requires heavy rigging with high tension which adds stress to the overall sail rig system; this is not really a disadvantage per se but rather a parameter to consider if rigging a sailboat to use a mast aft rig.
Split into simpler sentences: This requires heavy rigging with high tension which adds stress to the overall sail rig system. Not really a disadvantage, but a parameter to consider if rigging a sailboat to use a mast aft rig.