Complex sentence: Osborne served as senior partner for that organization from 1994 through 2014, working with governments large and small--from cities, counties, and school districts to states, federal agencies, and foreign governments.
Split into simpler sentences: Osborne served as senior partner for that organization from 1994 through 2014. He worked with large and small governments from cities, counties, and school districts to states, federal agencies, and foreign governments.