Simplify the following text for a Grade 8 native English-speaking person.
Original: On his return from Siberia in 1917 , Chernyi enjoyed great popularity among Moscow workers as a lecturer , and was at this time one of Russia 's leading individualist anarchists and one of anarchism 's main ideologues .
Simplified: On his return from Siberia in 1917 he enjoyed great popularity among Moscow workers .