“Saurdier says that with determination.”
That ‘that’ is unnecessary. It’ll be well written if it was “Saurdier says with determination”. In fact, it should be like that.
“Occasionally he dress up like Santa.”
He dresses* up like Santa, it’s present simple so an s is required and therefore, and e before it.
I have seen those two misspellings, just for you to check them and incorporate the corrections for the next update.
Thank you so much and have a nice day