Hello, my question is simply as stated in the Thread title. Should I place a comma after the phrase Fifteen years ago found in the sentence below? "Fifteen years ago, local firefighters were called to the nearby hospital after it having succumb to an accidental fire." Several random posts on internet forums I have read suggested in a situation like this no comma is needed. Likewise, I have read other forums were they claim the opposite. What are your thoughts? Btw for the phrase "after it having succumb to" ... did I structure it well? Or should I reword it? Thanks!!