Complex sentence: The road to Wolverhampton passed straight through the Somerford grounds, which Monckton was reforesting and improving, so he had it diverted north and paid to construct a new section to Four Ashes, on the main turnpike road between Wolverhampton and Stafford.
Split into simpler sentences: The road to Wolverhampton passed straight through the Somerford grounds, which Monckton was reforesting and improving. So Mockton agreed to divert it to the north of his property and paid to construct a new section to Four Ashes, on the main turnpike road between Wolverhampton and Stafford.