Complex sentence: In recent years, the Sounds have been attempting to work out an agreement with the city in order to build a new ballpark to replace Greer, an aging stadium which was not meant to last longer than 30 years.
Split into simpler sentences: In recent years, the Sounds have been attempting to work out an agreement with the city in order to build a new ballpark to replace Greer. The aging stadium was not meant to last longer than 30 years.