Simplify the following text for a Grade 13 native English-speaking person.
Original: They spanned all classes and included military soldiers and officers , Cossacks , intellectuals of various professions , dispossessed businessmen and landowners , as well as officials of the Russian Imperial Government and various anti-Bolshevik governments of the Russian Civil War period .
Simplified: These classes included military soldiers and officers , Cossacks , intellectuals , businessmen and landowners . Officials of the Russian Imperial Government and anti-Bolshevik governments of the Russian Civil War also left .