Simplify the following text for a Grade 15 native English-speaking person.
Original: When the All Jammu and Kashmir Muslim Conference was converted into a secular political party in 1939 , the Muslim leaders amended the Constitution of the Muslim Conference , renamed it as the All Jammu and Kashmir National Conference , modified its objectives and threw its membership open to all the people of the State .
Simplified: At this point the Muslim leaders amended the Constitution of the Muslim Conference , renamed it the All Jammu and Kashmir National Conference , modified its objectives , and threw its membership open to all the people of the State .