Simplify the following text for a Grade 11 native English-speaking person.
Original: London , 2005 ) ) Ole Nydahl ( born 19 March 1941 in Copenhagen , Denmark ) is the founder and leader of Diamond Way Buddhism , an organization in the Karma Kagyu school of Tibetan Buddhism .
Simplified: With his wife , Hannah Nydahl , he founded Diamond Way Buddhism , a worldwide lay organization of Karma Kagyu Buddhism .