Complex sentence: By age 19 he was spotted at a music venue in London's Covent Garden by Tim Byrne, manager of UK pop act Steps, looking for suitable members to form a new pop group.
Split into simpler sentences: By age 19 he was spotted at a music venue in Covent Garden, London, by Tim Byrne the manager of UK pop act Steps. At the time Tim Byrne was looking for suitable members to form a new pop group.