Simplify the following text for a Grade 10 native English-speaking person.
Original: Moussa belonged to a group of intellectuals who vehemently demanded the simplification of Arabic and its grammar and the recognition of Egyptian Arabic as the Modern Egyptian language , which inflamed the criticism of his conservative opponents .
Simplified: Moussa belonged to a group of intellectuals who wanted to simplify Arabic and its grammar . They wanted Egyptian Arabic to officially become the Modern Egyptian language .