Literature remains the interest of a minority and the majority has chosen to ignore those aspects of language which , at school they were told to value highly
What is not clear to you?
Literature remains the interest of a minority, and the majority has chosen to ignore those aspects of language which at school they were told to value highly.
Punctuation does make it more clear.
a minority - we don't know anything about those people.
the majority - the rest of those whose opinion is considered.