Complex sentence: Bert says he will get someone on the case, but the chap insists that the top man does the job himself, so Bert ends up queuing at the hospital where he is mistaken for an eminent diagnostician.
Split into simpler sentences: Bert says he will get someone on the case, but the chap insists that the top man does the job himself. So Bert ends up queuing at the hospital where he is mistaken for an eminent diagnostician.