Complex sentence: The film was scheduled to begin on January 17th, 1987 in New Delhi but, due to tight security following communal violence in Delhi, it was postponed to January 29th which created a huge loss to the producer.
Split into simpler sentences: The film was scheduled to begin on 17 January 1987 in New Delhi. But due to tight security following communal violence in Delhi, it was postponed to January 29 which created a huge loss to the producer.