Complex sentence: When completed, the Silver Comet Trail will start in Smyrna, Georgia and end at the Georgia/Alabama state line, where it will connect to the 33-mile long Chief Ladiga Trail that ends in Anniston, Alabama.
Split into simpler sentences: When completed, the Silver Comet Trail will start in Smyrna, Georgia and end at the Georgia/Alabama state line. At the Georgia/Alabama state line, the Silver Comet will connect to the 33-mile long Chief Ladiga Trail that ends in Anniston, Alabama.