It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using variations of passages is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English. Many desktop publishing packages and web page editors now use variations of passages as their default model text, and a search for 'variations of passages' will uncover many web sites still in their infancy. Various versions have evolved over the years, sometimes by accident, sometimes on purpose.
There are many variations of passages of variations of passages available, but the majority have suffered alteration in some form, by injected humour, or randomised words which don't look even slightly believable. If you are going to use a passage of variations of passages you need to be sure there isn't anything embarrassing hidden in the middle of text.
All the variations of passages generators on the Internet tend to repeat predefined chunks as necessary, making this the first true generator on the Internet.