Complex sentence: He obeys his domineering wife's orders (presumably because it's easier than listening to her complain and rant), which usually involve contrived plots to either impress neighbours or aristocrats, or a far-fetched plan to avoid Hyacinth's down-market family.
Split into simpler sentences: He obeys his domineering wife's orders (presumably because that is easier than listening to her complain and rant). These orders usually involve contrived plots to impress neighbours or aristocrats, or a far-fetched plan to avoid Hyacinth's down-market family.