Complex sentence: The proposed expansion had proven to be controversial, with the Linn County Conservation Board worried about environmental impact such an expansion would have on the area-especially the Rock Island Forest Preserve, however, as of May 2014, construction has begun on its 10 mi.
Split into simpler sentences: The proposed expansion had proven to be controversial, with the Linn County Conservation Board worried about environmental impact such an expansion would have on the area-especially the Rock Island Forest Preserve. However, as of May 2014, construction has begun on its 10 mi.