Complex sentence: The Chicago Central and Pacific Railroad is part of the Illinois Central Railroad (IC) mainline owned by Canadian National Railway (CN) through the Grand Trunk Corporation and is designated as the Iowa Zone of CN's North Division.
Split into simpler sentences: The Chicago Central and Pacific Railroad is part of the Illinois Central Railroad (IC) mainline owned by Canadian National Railway (CN) through the Grand Trunk Corporation. Operationally the Chicago Central and Pacific is designated as the Iowa Zone of CN's North Division.