Original: In addition to his compositions, Boughton is remembered for his attempt to create an "English Bayreuth" at Glastonbury, establishing the first series of Glastonbury Festivals. (They ran with enormous success from 1914 until 1926).
Simplified: Boughton wanted to create an "English Bayreuth" at Glastonbury, so he started the series of Glastonbury Festivals that took place from 1914 until 1926.