Complex sentence: The fixed stipends on which samurai lived did not increase despite the rising cost of commodities and the increasingly burdensome cost of proper social etiquette so many samurai became in debt to wealthy merchant families.
Split into simpler sentences: The fixed stipends on which samurai lived did not increase despite the rising cost of commodities and the ever more burdensome cost of proper social etiquette. As a result, many samurai became in debt to wealthy merchant families.