Complex sentence: A memorial service was held on 17 September 2001 at St. Martin-in-the-Fields church, Trafalgar Square, London, the first church service broadcast live on the web by the BBC.
Split into simpler sentences: A memorial service was held on 17 September 2001 at St. Martin-in-the-Fields church, Trafalgar Square, London. This became the first church service broadcast live on the web by the BBC.