Complex sentence: The high inflation that Miller allowed required harsh "shock therapy" treatment by his successor Paul Volcker to bring inflation under control, which sent the U.S. economy into recession from 1980 to 1982.
Split into simpler sentences: The high inflation that Miller allowed required harsh "shock therapy" treatment by his successor, Paul Volcker, to bring inflation under control. This sent the U.S. economy into recession from 1980 to 1982.