Complex sentence: Carl Friedrich Echtermeier, the son of a gypsum moulder in Kassel, Germany, trained at his father's workshop and went on to study at the art academies of Kassel, Munich and Dresden.
Split into simpler sentences: Carl Friedrich Echtermeier, the son of a plasterer in Kassel, Germany, learnt the basics of his craft at his father's workshop. He went on to study at the art academies of Kassel, Munich and Dresden.