Complex sentence: In 1811, the Folie-Richelieu was transformed into a park, then demolished completely in 1851 in the redevelopment under Baron Haussmann to make way for the church of Sainte-Trinité de Paris with part of the site becoming a roller skating rink.
Split into simpler sentences: In 1811, the Folie-Richelieu was transformed into a park, then demolished completely in 1851 in the redevelopment under Baron Haussmann. It became the site of the church of Sainte-Trinité de Paris with part of the site becoming a roller skating rink.