Complex sentence: The town was reconstructed within a few years, but the process left many local people in debt, causing the bankruptcy of many small enterprises, especially Ryokan, over the next 20 years.
Split into simpler sentences: The town was reconstructed within a few years, however many townspeople eventually ran into debts. In the wake of these debts many small enterprises, especially Ryokan went bankrupt during the next 20 years.