Complex sentence: She formed Seven Springs Press in 1998 to publish the 20th-anniversary edition of "Mommie Dearest" in paperback from the original manuscript and included material omitted from the first printing about the years after her graduation from high school.
Split into simpler sentences: She formed Seven Springs Press in 1998 to publish the 20th-anniversary edition of "Mommie Dearest" in paperback from the original manuscript. This included material omitted from the first printing about the years following her graduation from high school.