Complex sentence: Weir and Barlow maintained contact throughout the years; a frequent visitor to Timothy Leary's facility in Millbrook, New York, Barlow introduced the musical group to Leary in 1967.
Split into simpler sentences: Weir and Barlow maintained contact throughout the years. As a frequent visitor to Timothy Leary's facility in Millbrook, New York, Barlow introduced the musical group to Leary in 1967.