Complex sentence: Dr. John Reubec Vallentyne and Dr. W. E. Johnson participated in the development of the Freshwater Institute of Winnipeg (Manitoba, Canada) and then in the creation of the Experimental Lakes Area (ELA).
Split into simpler sentences: Dr. John Reubec Vallentyne and Dr. W. E. Johnson participated in the development of the Freshwater Institute of Winnipeg (Manitoba, Canada). They participated in the creation of the Experimental Lakes Area (ELA).