'The patron complainedabout the bad service in the restaurant' is fine.
In your second sentence you would need to specify what they were patrons of - perhaps something like 'All the patrons ran out of the hotel....'
These forums do not provide free schoolwork. If you want help with a school assignment, you are required to do your own work first. Then, and only then, may you post it with a request for help with specific doubts.
Those responding to such requests should NOT rewrite the student's homework, but suggestions for areas of improvement are acceptable. It serves no useful purpose to have students present our work as if it were their own.