Simplify the following text for a Grade 7 native English-speaking person.
Original: After the line became extinct in 1371 , William I of JÃ 1\/4 lich inherited Guelders and from 1393 onwards held both duchies in personal union .
Simplified: When Reginald died without a heir in 1371 , William I of JÃ 1\/4 lich inherited Guelders .