Complex sentence: Shafilea disappeared on September 11,2003 and had been missing for a week before her teachers informed the police; subsequently there was a major campaign to urge people who had any information to come forward.
Split into simpler sentences: Shafilea disappeared on September 11,2003, and had been missing for a week before her teachers informed the police. Subsequently, there was a major campaign to urge people who had any information to come forward.