Complex sentence: He showed the blueprints to the "Fonds de Course" committee and received a 600,000 francs subsidy, but no V16 engine appeared and it was believed that he used the money to build a factory for Pratt & Whitney aircraft engines.
Split into simpler sentences: He showed the blueprints to the "Fonds de Course" committee and received a 600,000 francs subsidy. No V16 engine appeared but it was believed that he used the money to build a factory for Pratt & Whitney aircraft engines.