Simplify the following text for a Grade 13 native English-speaking person.
Original: An ecumenical council ( or oecumenical council ; also general council ) is a conference of the bishops of the whole Christian Church convened to discuss and settle matters of Church doctrine and practice .
Simplified: An Ecumenical Council ( also sometimes Oecumenical Council ) or general council is a meeting of the bishops of the church of the whole world who have come together to discuss matters of Church doctrine and practice .