Complex sentence: Bienville Square began as a public park in 1824 when the U.S. Congress passed an act that transfered a large plot of land to the city of Mobile and specified that the property be forever used as a city park.
Split into simpler sentences: Bienville Square began its transition into a public Square in 1824 when the U.S. Congress passed an act transferring a large plot of land to the city of Mobile. The act specified that the property be forever used as a city park.