Simplify the following text for a Grade 6 native English-speaking person.
Original: Currently there has never been a Princess of Orange in their own right except for Marie , Princess of Orange ( 1393-1417 ) , who co-reigned with her husband John , Prince of Orange ( 1393-1418 ) .
Simplified: The only woman who became a Princess of Orange without being married to a Prince of Orange was Marie , Princess of Orange ( 1393-1417 ) . Together with her husband John , Prince of Orange ( 1393-1418 ) , they governed the land .