Complex sentence: With a weekly allowance Green sent, Lovecraft moved to a working class area of Brooklyn Heights where he subsisted in a tiny apartment, having lost 40lb of weight by 1926, when he left for Providence.
Split into simpler sentences: With a weekly allowance Green sent, Lovecraft moved to a working class area of Brooklyn Heights where he subsisted in a tiny apartment. He had lost 40lb of bodyweight by 1926, when he left for Providence.