How many paintings are there called Garden?
What is the name of a series of oil paintings by Claude Monet depicting his flower garden at Giverney?
Many large paintings hung on the walls. You are talking about "paintings", the subject. "Many large" are descriptive words of paintings. The paintings "hung"-- the word of the action for the paintings. Many large and on the walls--Those are the words confusing you. Step back from wordy or complicated sentences and try to simplify them that way.