Complex sentence: After Gutenberg lost a lawsuit against his investor Johann Fust, Peter Schöffer was put by Fust in charge of Gutenberg's print shop, whereupon Gutenberg established a new print shop with the financial backing of another money lender.
Split into simpler sentences: After Gutenberg lost a lawsuit against his investor Johann Fust, Fust put Gutenberg's employee Peter Schöffer in charge of the print shop. Thereupon Gutenberg established a new one with the financial backing of another money lender.