Complex sentence: It travels for over 70 miles in a South-Easterly direction, along the Clyde and Tweed valleys, passing the towns of Larkhall, Lanark, Biggar and Peebles.
Split into simpler sentences: It travels for over 70 miles in a South-Easterly direction, along the Clyde and Tweed valleys. Passing the towns of Larkhall, Lanark, Biggar and Peebles.