Complex sentence: From Union west to Pleasant Hill, the line is generally in poor condition, and a 50-mile section between Pleasant Hill and Windsor, MO, is in the process of being officially abandoned by Ameren.
Split into simpler sentences: From Union west to Pleasant Hill, the line is unused and generally in poor condition. A 50-mile segment between Pleasant Hill and Windsor, MO, is in the process of being officially abandoned by Ameren.