Complex sentence: If a Freeman in need of a rest was in Highgate, he could kick a pig out of a ditch and take its place, but if there were three pigs, he could only chase away the middle one, and sleep between the other two.
Split into simpler sentences: If a Freeman in need of a rest was in Highgate, he could kick a pig out of a ditch and take its place. But if there were three pigs in the ditch, he could only chase away the middle one and sleep between the other two.