Complex sentence: As part of his work at the Walter Roth Museum, Simon took part in numerous anthropological expeditions to various parts of Guyana; and these expeditions had a profound impact on his life and his artistic development.
Split into simpler sentences: As part of his work at the Walter Roth Museum, Simon took part in numerous anthropological expeditions to various parts of Guyana. These expeditions were to have a profound impact on his life and his artistic development.