Complex sentence: A post house, posthouse, or posting house was a house or inn where horses were kept and could be rented or changed out.Postriders could also be hired to take travellers Collins English Dictionary 12th Edition 2014, HarperCollins Publisher by carriage or coach.
Split into simpler sentences: A post house, posthouse, or posting house was a house or inn where horses were kept and could be rented or changed out. They were also where postriders could be hired to take travellers Collins English Dictionary 12th Edition 2014, HarperCollins Publisher by carriage or coach.