Complex sentence: Ian Clunies Ross also demonstrated that a toxin produced by the tick was responsible for the paralysis and not some infective agent carried by the ticks Clunies-Ross I (1926) An Experimental Study of Tick Paralysis.
Split into simpler sentences: Ian Clunies Ross also demonstrated that a toxin produced by the tick was responsible for the paralysis and not some infective agent carried by the ticks. By 1926 Clunies-Ross had investigated tick paralysis more fully Clunies-Ross I (1926) An Experimental Study of Tick Paralysis.