Complex sentence: They were thought to have been murdered two days earlier between about 3:00 pm and 4:00 pm on Friday, 29 April, 2011the day of the Royal Wedding of Prince William and Kate Middleton and an additional Public Holiday in the United Kingdom.
Split into simpler sentences: They were thought to have been murdered two days earlier at about 3 to 4pm on Friday, 29 April, 2011. This was the day of the Royal Wedding of Prince William and Kate Middleton and an additional Public Holiday in the United Kingdom.