Complex sentence: A brief recession led to layoffs, and McDonald negotiated job security provisions, which saved workers' jobs, but when the economy recovered in 1963 and 1964, industry profits did not lead to wage increases.
Split into simpler sentences: A brief recession led to layoffs, and McDonald negotiated job security provisions which saved workers' jobs. But when the economy recovered in 1963 and 1964, industry profits did not lead to wage increases.