Complex sentence: Given his knowledge of woodwork and metal forging, he quickly learned the skills of a sculptor in stone, remaining largely self-taught for his entire career: he left the Community to work on his own in 1975.
Split into simpler sentences: Given his knowledge of woodwork and metal forging, he quickly learned the skills of a sculptor in stone, remaining largely self-taught for his entire career. Henry left the Community to work on his own in 1975.