Complex sentence: The Philadelphia and Delaware County Rail-Road Company was chartered in Pennsylvania on April 2,1831, changing its name on March 14,1836, to the Philadelphia, Wilmington and Baltimore Railroad Company.
Split into simpler sentences: The Philadelphia and Delaware County Rail-Road Company was chartered in Pennsylvania on April 2,1831. It changed its name on March 14,1836 to the Philadelphia, Wilmington and Baltimore Railroad Company.