Original: George Berkeley (12 March 1685 14 January 1753), also known as Bishop Berkeley, was an Anglo-Irish philosopher whose primary achievement was the advancement of a theory he called "immaterialism" (later referred to as "subjective idealism" by others).
Simplified: George Berkeley (12 March 1685   14 January 1753), also known as Bishop Berkeley, was a philosopher. His main philosophical achievement was the advancement of a theory he called "immaterialism" (later referred to as "subjective idealism" by others).