Complex sentence: Credit Suisse played a substantial role in the economic development of Switzerland by helping the country develop its currency system, funding entrepreneurs and investing in the Gotthard railway, which connected Switzerland to the European rail system in 1882.
Split into simpler sentences: Credit Suisse played a substantial role in the economic development of Switzerland. Suisse helped the country develop its currency system, funding entrepreneurs and investing in the Gotthard railway, which connected Switzerland to the European rail system in 1882.