Complex sentence: When she met Millais five years later Effie was still a virgin, as Ruskin had persistently put off consummating the marriage, for reasons that are unclear, but which involved disgust with some aspect of her body.
Split into simpler sentences: When she met Millais five years later Effie was still a virgin, as Ruskin had persistently put off consummating the marriage. His reasons are unclear, but they involved disgust with some aspect of her body.