Complex sentence: In late 1958, Steichen, Ravitch, and Ravitch's then-current Chief Resident, Dr. Peter Weil, began laboratory experiments using stapling instruments that Mark Ravitch had procured in Moscow during a medical experts' visit to the Soviet Union that was unrelated to stapling.
Split into simpler sentences: In late 1958, Steichen, Ravitch, and Ravitch's then-current Chief Resident, Dr. Peter Weil, began laboratory experiments with stapling instruments. The staplers they used had been procured by Mark Ravitch in Moscow during a medical experts' visit to the Soviet Union that was unrelated to stapling.