Complex sentence: On the domestic front, Eisenhower covertly opposed Joseph McCarthy and contributed to the end of McCarthyism by openly invoking the modern expanded version of executive privilege, otherwise leaving most political activity to his Vice President, Richard Nixon.
Split into simpler sentences: On the domestic front, he covertly opposed Joseph McCarthy and contributed to the end of McCarthyism by openly invoking the modern expanded version of executive privilege. He otherwise left most political activity to his Vice President, Richard Nixon.