Complex sentence: However, the machinery of the clock was not worked on, and on 24 May 2006, the clock stopped for the first time in 28 years with the display inactive at 7:28 for about one day.
Split into simpler sentences: However, the machinery of the clock was not worked on, and on 24 May 2006, the clock stopped for the first time in 28 years. With the display inactive at 7:28 for about one day.