Complex sentence: Afterwards in 1952 and 1953 she was subpoenaed to appear before a subcommittee of Senator Joseph McCarthy's House Committee on Un-American Activities for questioning, in which she responded negatively to the committee's demands that she name colleagues with communist sympathies.
Split into simpler sentences: Afterwards in 1952 and 1953 she was subpoenaed to appear before a subcommittee of Senator Joseph McCarthy's House Committee on Un-American Activities for questioning. She responded negatively to the committee's demands that she name colleagues with communist sympathies.