Complex sentence: Marxian economists object to this accounting procedure on the ground that the monetary imputation made refers to a flow of income which does not exist, because most home owners do not rent out their homes if they are living in them.
Split into simpler sentences: Marxian economists object to this accounting procedure on the ground that the monetary imputation made refers to a flow of income which does not exist. It does not exist, because most home owners do not rent out their homes if they are living in them.