Complex sentence: Under the Porter administration, the Seneca Nation made an effort to diversify its business offerings and promoted, through an economic development corporation, the creation of new Seneca-owned businesses, outside the nation's traditional strongholds of gasoline retail and tobacco products.
Split into simpler sentences: Under the Porter administration, the Seneca Nation made an effort to diversify its business offerings. It promoted the creation of new Seneca-owned businesses, outside the nation's traditional strongholds of gasoline retail and tobacco products.