Complex sentence: The very important 108 mile Dayton & Western Traction Company interchanged with the C&LE at Dayton and connected to the Indiana Railroad at Richmond, Indiana to provide joint operation of interurban freight and passenger trains between the two.
Split into simpler sentences: The very important 108 mile Dayton & Western Traction Company was their link. It interchanged with the C&LE at Dayton and connected to the Indiana Railroad at Richmond, Indiana, to provide exchange of interurban freight and passenger trains between the two.