Simplify the following text for a Grade 9 native English-speaking person.
Original: Wittgenstein wanted to study with Frege , but Frege suggested he attend the University of Cambridge to study under Russell , so on 18 October 1911 Wittgenstein arrived unannounced at Russell 's rooms in Trinity College .
Simplified: In 1911 Wittgenstein visited Frege and Russell and discussed philosophy with them at great length .