Complex sentence: Marion has grown tremendously since 1970 and is in the process has been selected for Illinois' first STAR Bonds District for the Millennium Development, a project originally designed for a city ten times its size.
Split into simpler sentences: Marion has grown tremendously since 1970 and is in the process has been selected for Illinois' first STAR Bonds District for the Millennium Development. A development project originally designed for a city ten times its size.