Complex sentence: The main portion of the KD Line was abandoned by the CNW on May 31,1939, although the eastern and western portions currently survive for freight service in Kenosha and both freight and passenger service in Rockford.
Split into simpler sentences: The main portion of the KD Line was abandoned by the C&NW on May 31,1939. The line's eastern and western portions currently survive for freight service in Kenosha and both freight and passenger service in Rockford.