Simplify the following text for a Grade 6 native English-speaking person.
Original: According to Greenson , the marriage between Miller and Monroe was strained ; he said that Miller appeared to genuinely care for Monroe and was willing to help her , but that Monroe rebuffed while also expressing resentment towards him for not doing more to help her .
Simplified: According to Greenson , the marriage between Miller and Monroe was strained . He said that Miller appeared to genuinely care for Monroe and was willing to help her .