Complex sentence: Burns later recalled that he wasn't upset by this, though he knew that people would expect him to be; he stated that he already knew the man, who drove him to Raby Mere and threatened him with an air gun.
Split into simpler sentences: Burns later recalled that he wasn't upset by this, though he knew that people would expect him to be. He stated that he already knew the man, who drove him to Raby Mere and threatened him with an air gun.