Complex sentence: American journalist Al Aronowitz introduced them to Dylan when the Beatles visited New York in February 1964, and Dylan subsequently became a big influence on the group, especially Lennon, who even started wearing a copycat Huckleberry Finn cap.
Split into simpler sentences: American journalist Al Aronowitz personally introduced them to Dylan when the Beatles visited New York in February 1964, and Dylan subsequently became a big influence on the group. Especially Lennon, who even started wearing a copycat Huckleberry Finn cap.