Please paraphrase the following to simple English

where teachers regularly convene to clarify marking criteria and standards.

This is a place where teachers regularly meet to discuss and make clear the criteria and standards for marking.

This means that teachers often meet up to discuss and make clear the rules and guidelines for grading and evaluating students' work.

This is where teachers often come together to discuss and make clear the rules for grading and the expectations for how well students should perform.