well-known + noun
She is a well-known writer.
well-known + for + noun
France is well-known for its wine.
well-known + for + -ing form
The town is well-known for growing watermelons.
well-known + to + noun
He is well-known to the local police.
it is + well-known + that + clause
It is well-known that caffeine is a stimulant.
it is + a well-known fact + that + clause
It is a well-known fact that caffeine is a stimulant.