Complex sentence: In June, Garner announced that he had decided to leave the band, although he stayed until they found a replacement, playing his final gig with the band at the'Larks in the Park' festival in Liverpool.
Split into simpler sentences: In June, Garner announced that he had decided to leave the band, although he stayed until they found a replacement. He played his final gig with the band at the'Larks in the Park' festival in Liverpool.