Complex sentence: He was a guest speaker at the Cambridge Science Festival in March 2015, and published a guest essay in The journal of the Royal Society of Medicine in April 2015, discussing issues of medical accuracy and communication in "Call the Midwife".
Split into simpler sentences: He was a guest speaker at the Cambridge Science Festival in March 2015. He published a guest essay in the Journal of the Royal Society of Medicine in April 2015, discussing issues of medical accuracy and communication in "Call the Midwife".