Complex sentence: The three performed their first gig as Emerson, Lake & Palmer at the Guildhall in Plymouth on 23 August 1970, but it was their performance at the Isle of Wight Festival on 29 August that drew the most attention.
Split into simpler sentences: The three performed their first gig as Emerson, Lake & Palmer at the Guildhall in Plymouth on 23 August 1970. Their performance at the Isle of Wight Festival on 29 August that drew the most attention.