Complex sentence: Sorrow was likely produced in the spring of 1882, between the encounter with Hoornik in January and the birth of her son in July, it is mentioned in a letter to Van Gogh's brother Theo dated 10th April 1882.
Split into simpler sentences: Sorrow was likely produced in the spring of 1882, between the encounter with Hoornik in January and the birth of her son in July. It is mentioned in a letter to Van Gogh's brother Theo dated 10th April 1882.