Complex sentence: In February 1964, Hedren alleged, Hitchcock propositioned her sexually, and when she turned him down, he said he would ruin her; thereafter he would not speak to her and referred to her as "the girl".
Split into simpler sentences: In February 1964, Hedren alleged, he propositioned her sexually, and when she turned him down, he said he would ruin her. Thereafter he would not speak to her directly and referred to her only as "the girl".