Complex sentence: The three DTC blocks are Baldwin from milepost SM-0.18 to SM-5.0 followed by Fouraker from the SM-5.0 to SM-15.4 and last is Crawford from SM-15.4 to SM-20.0.
Split into simpler sentences: The three DTC blocks are Baldwin from milepost SM-0.18 to SM-5.0 followed by Fouraker. The last is Crawford from the SM-15.4 to SM-20.0.