Complex sentence: By the 1960s the Hewitt firm continued to expand its pension and benefit plans, creating more sophisticated programs for its clients, and Hewitt became the first company to design pension and benefit plans tied to a corporation's revenue and growth projections.
Split into simpler sentences: By the 1960s the Hewitt firm continued to expand its pension and benefit plans, creating more sophisticated programs for its clients. During the decade the firm revolutionized employee benefit packages once again, as the first company to design pension and benefit plans tied to a corporation's revenue and growth projections.