Original sentence: A History of Man puts forward a number of claims, many of which are not considered at all compatible with scientific consensus, to describe the origins of humanity according to Scientology.The book also claimed that the Earth is much older than the five billion years or so that science describes.The book puts forward the notion that clam-like alien creatures called boohoos and weapers were tossed into the Earth's oceans millions of years ago, and that those clams have evolved into humanity, which retains psychological problems due to the enturbulation these clams experienced by the agitation of ocean waves.The first original versions of the work are considered collector's items, as later versions have been heavily altered to remove notions that were considered rather embarrassing by the people who took over Scientology and who have been rewriting (also known as squirreling) Hubbard's writings since his death
Edited sentence: A History of Man puts forward a number of claims, many of which are deemed controversial, presented by Hubbard to describe the genetic history of humanity according to his own line of research.As in all his material, Hubbard encourages the reader to form his own opinion after his own review of the material.Hubbard describes a number of vivid incidents pertaining to that history.The book, which is generally written for an open minded readership, puts forward the notion that the history of mankind may go further back in time than was  estimated by the archeologists and scientists of the mid 20th century