Complex sentence: Hawker Siddeley submitted its design to NATO on 8 January 1962, and in May that year, the P.1154 emerged as the winner in the competition for the NBMR.3 over the Mirage IIIV.
Split into simpler sentences: Hawker Siddeley submitted its design to NATO on 8 January 1962. The P.1154 emerged as the winner in the competition for the NBMR.3 requirement over the Mirage IIIV.