More standard English is they just don’t provide as good a care. The idea is that they just don’t provide as good a care as the care that is probably mentioned somewhere else in your text.
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More standard English is they just don’t provide as good a care.
The idea is that
The speaker made a mistake. He didn't mean "a care". I'll bet he actually said "of care", a common blunder. Doctors and nurses are said to provide care.
Siavash Moghaddasianthey just don’t provide as good a care.
"as X a Y (as Z)" is a set pattern of words, meaning "a Y that is as X (as Z)". In this case:
"as good a care (as Z)" = "a care that is as good (as Z)", where Z, the thing that it is being compared to, m