Complex sentence: This would make the retinal vein occlude due to the vasoconstricting effects of lysophosphatidylcholine and could cause wet macular degeneration; conversely, if one is not taking a demyelinating agent into or around one's eye, then one would have dry macular degeneration and no retinal occlusion.
Split into simpler sentences: This would make the retinal vein occlude due to the vasoconstricting effects of lysophosphatidylcholine and could cause wet macular degeneration. If one is not taking a demyelinating agent into or around his or her eye, then one would have dry macular degeneration and no retinal occlusion.