Complex sentence: In May 2009, after waiting four years, Armstrong made his New York debut opening a Table 8 in The Cooper Square Hotel where he has been in charge of all the food and drink at the hotel since December 2008.
Split into simpler sentences: In May 2009, after waiting four years, Armstrong made his New York debut opening a Table 8 in The Cooper Square Hotel. He has been in charge of all the food and drink at the hotel since December 2008.