Original: There, in 1940, Britten composed Seven Sonnets of Michelangelo, the first of many song cycles for Pears. Upon their return to England in 1942, they performed this song cycle at Wigmore Hall on 23 September, and then recorded them for EMI, their first recording together.
Simplified: Back in England they performed Britten's song cycle Seven Sonnets of Michelangelo together at the Wigmore Hall in London (Britten was an excellent pianist), and then recorded them for EMI, their first recording together.