Complex sentence: This type of thief usually travelled and robbed by horse, as compared to a footpad who travelled and robbed on foot; mounted highwaymen were widely considered to be socially superior to footpads.
Split into simpler sentences: This type of outlaw usually travelled and robbed by horse, as compared to a footpad who travelled and robbed on foot. Mounted robbers were widely considered to be socially superior to footpads.