premise: He transformed the old Rouvre forest, left completely wild until 1852, into the closest thing Paris has to a London-style park, with roads and paths for cycling and rambles, horse trails, boating lakes, restaurants and cafe with open-air dancing ' and, in addition, the grand race course at Longchamp.
hypothesis: The Rouvre forest was transformed by him to be the closest thing to a London-style park that Paris has.