The young man suffered in chronic pain, since the day the car had nearly ran him over.
or
Since the day the car had hit him, the young man suffered in chronic pain.
He suffered from chronic pain that never left him .
sollidarity
no, a complex-complex sentence is just a complex sentence. there is no such thing as a complex-complex sentence.
There was a business complex full of caravans.
It is 2 independent clauses put together by a connective.
Asthma can cause a chronic cough.
'Please help, my brother has a chronic disease!'
Chronic sinusitis can me a life long condition
I put the camera on top of the tripod to keep it steady.
A compound complex sentence is when you combind a compound sentence and a complex sentence.
Cancer is a chronic disease.
He provided an explanatory explanation for the complex topic.