Complex sentence: The validity of the Cholodny-Went model is still disputed among plant physiologists, and new research is being put into the roles of other plant hormones on the growth process as well as into gravitropic and phototropic properties of plants through modern time-lapse photography.
Split into simpler sentences: The validity of the Cholodny-Went model is still disputed among plant physiologists, and new research is being put into investigating this effect. Current research is being done both on the roles of other plant hormones in the growth process and on the gravitropic and phototropic properties of plants using modern time-lapse photography.