Complex sentence: As more companies go overseas to capture the upside of foreign trade, they provide no jobs for American working poor, which ultimately increases inequality gap between the poor and the rich, and contributes to economic inefficiency.
Split into simpler sentences: As more companies go over sea to capture the upside of foreign trade, they provide no jobs for Americans and for the working poor. This lack of job creations for the poor ultimately increases inequality gap between the poor and the rich, and contribute to economic inefficiency.