Complex sentence: The workplace atmosphere at large factories was often tense because of resentment built up between management and labor unions throughout the 1930s and directors of companies such as General Motors (GM) sought to minimize past friction and encourage teamwork.
Split into simpler sentences: The workplace atmosphere at large factories was often tense because of resentment built up between management and labor unions throughout the 1930s. Directors of companies such as General Motors (GM) sought to minimize past friction and encourage teamwork.