Complex sentence: Returning to Australia and the Australian National University in 1978, he cloned the human renin gene and cloned the human endorphin gene, going on to demonstrate that human hormone genes cloned in bacteria could be expressed in a biologically active form.
Split into simpler sentences: Returning to Australia and the Australian National University in 1978. He cloned the human renin gene and cloned the human endorphin gene, going on to demonstrate that human hormone genes cloned in bacteria could be expressed in a biologically active form.