Use a proper pronoun
I was sitting on a chair which belonged to my grandmother.
DEFINING.
I know a man who played for Arsenal in the 80s.
DEFINING.
New Zealand, whose landscapes are simply spectacular, is my favourite country.
NON-DEFINING.
The King of Spain, who loves sailing, participated in the Olympics.
NON-DEFINING.
The king of England who created the Anglican Church was Henry VIII.
DEFINING: