English comma question, how to type English comma

This sentence covers two grammatical phenomena: "non-restrictive definite clause" and "past participle phrase as a postpositional preposition". After the full sentence = the report ,which was published in the ama,was based on the researcher's own earlier research.That is, a sentence containing a "non-restrictive definite clause", and a "non-restrictive definite clause" requires a comma to be separated from the modified antecedent.

The sentence you provided omitted which was changed from a "non-restrictive predicative clause" to a "past participle phrase as a postpositional preposition". Their syntactic function is the same - the definite, but in a different form.

To learn English grammar, you must first memorize commonly used noun terms, such as the non-restrictive definite clause, past participle phrases (including the two concepts of "past participle" and "phrase"), postpositional predicates, antecedents, syntactic effects (i.e., components in the sentence), etc. Otherwise, it will be difficult to understand.

published is a past participle as a postpositional clause, which is equivalent to a non-restrictive definite clause.

It should be that it is not a predicate, so instead of being published, the two commas before and after are inserted into a definite clause.

the report was based on the researcher's own earlier research。is the main clause.

These two commas have and do not have the same meaning here, published in the ama is used as a postposition definite to modify report, published is not used as a verb

A non-restrictive definite clause, omitting which is(was), in fact the part separated by the middle comma is optional, because its appearance does not restrict anything, but only as a supplement.

Tools Raw materials: Lenovo Tianyi 510pro, win7.

Tools Raw materials: Lenovo Tianyi 510pro, win7.