Original sentence: The first artist to perform was the group Stackridge; the headline act was T Rex.The first festival at Worthy Farm  was mounted by Michael Eavis in 1970, an event of 1,500 people called the Pilton Festival
Edited sentence: It was much in the spirit of many small events held in farms around the country at that time.The first festival at Worthy Farm was a small scale event of 1,500 people called the Pilton Festival, and was mounted by Michael Eavis in 1970,  The first artist to perform was the group Stackridge; the headline act was T Rex