After being ill with a cold for some time, Lockwood decides that he has had enough of the moors and travels to Wuthering Heights to inform Heathcliff that he is returning to the south.
He is returning to the south. He has had enough of the moors. He travels to Wuthering Heights. This is to inform Heathcliff this. Lockwood decides this. Lockwood was being ill with a cold for some time.