Complex sentence: In late 1884, Margot Begemann, a neighbour's daughter and ten years his senior, began joining him on his painting forays; she fell in love, and he reciprocated--though less enthusiastically.
Split into simpler sentences: In late 1884, Margot Begemann, a neighbour's daughter and ten years his senior, often joined him on his painting forays. She fell in love, and he reciprocated--though less enthusiastically.