Complex sentence: Rickman attended Derwentwater Primary School in Acton, a school that followed the Montessori method of education, and then Latymer Upper School in London through the Direct Grant system, where he became involved in drama.
Split into simpler sentences: Rickman attended Derwentwater Primary School in Acton, a school that followed the Montessori method of education. He attended Derwentwater Junior School, and then Latymer Upper School in London through the Direct Grant system, where he became involved in drama.