Complex sentence: During this time, Sean also took a liking to Dr. Monica Quartermaine and the two began to have a love affair, that was angrily opposed by both Edward Quartermaine and Monica's on and off love Alan Quartermaine.
Split into simpler sentences: During this time, Sean also took a liking to Dr. Monica Quartermaine. The two began to have a love affair, angrily opposed by both Edward Quartermaine and Monica's on and off love Alan Quartermaine.