Complex sentence: Founded in 1960 by Delford M. Smith, Evergreen is primarily known for commercial helicopter operations in agricultural and forestry applications, but they have expanded into fixed wing aircraft and have split into a number of subsidiary divisions.
Split into simpler sentences: Founded in 1960 by Delford M. Smith, Evergreen is primarily known for commercial helicopter operations in agricultural and forestry applications. The business has subsequently expanded into fixed wing aircraft and has split into a number of subsidiary divisions.