Complex sentence: Through Ayerst he met W.H. Auden, who introduced him to T.S. Eliot; although no deep friendship developed with either poet, Eliot would later provide Tippett with invaluable help and advice in the preparation of oratorio and opera texts.
Split into simpler sentences: Through Ayerst he met W.H. Auden, who in due course introduced him to T.S. Eliot. Although no deep friendship developed with either poet, Eliot would later provide Tippett with invaluable help and advice in the preparation of oratorio and opera texts.