Complex sentence: His relationship with his father was stressful, as Karl Arlt was a very severe and austere man, by Arlt's own account, and the memory of his oppressive father would appear in several of his writings.
Split into simpler sentences: His relationship with his father was stressful, as Karl Arlt was a very severe and austere man, by Arlt's own account. The memory of his oppressive father would appear in several of his writings.