J’ai vu [ la [ plus belle parade]] hier [ [Ø] qu’ il y a pas eu [plus belle parade] à Montréal depuis 10 ans].
I.have seen  the  most beautiful parade yesterday  that there.is negₓ had  in Montreal since 10 years
I have seen the most beautiful parade yesterday s.t. there has not been a more beautiful parade in Montreal in the last 10 years.