Complex sentence: From 1967 to 1973 he was a biochemist and cell biologist at the University of Cambridge, after which he was principal plant physiologist at the ICRISAT until 1978.
Split into simpler sentences: From 1967 to 1973 he was a biochemist and cell biologist at the University of Cambridge. After his time at Cambridge, Sheldrake was principal plant physiologist at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) until 1978.