Simplify the following text for a Grade 5 native English-speaking person.
Original: Coventry is effectively in the center of the Warwickshire area , and still has strong ties with the county . Coventry and Warwickshire are sometimes treated as a single area and share a single NHS trust and ambulance service as well as other institutions .
Simplified: Coventry has been a part of Warwickshire for only some of its history .