Complex sentence: Rob tells him that his symptoms are more serious and his friend tells him he might have CJD and that he will have him tested straight away and destroyed Rob's medical notes so that he can get medical insurance.
Split into simpler sentences: Rob tells him that his symptoms are more serious and his friend tells him he might have CJD and that he will have him tested straight away. He also destroys Rob's medical notes so that he can get medical insurance.