Complex sentence: As the Chief of Staff to the New York City Deputy Mayor for Finance and Economic Development from 1989-1993, Schlein designed and implemented the city's economic development and finance policies, and he spearheaded the effort to consolidate seven economic development agencies into two.
Split into simpler sentences: As the Chief of Staff to the New York City Deputy Mayor for Finance and Economic Development from 1989-1993, Schlein designed and implemented the city's economic development and finance policies. He also spearheaded the effort to consolidate seven economic development agencies into two.