Complex sentence: The original was sent to Mary in London, who decrypted the code using a book that Holmes had noticed in Moriarty's office during their first meeting, before passing the information to Inspector Lestrade, who seizes Moriarty's assets and donates his fortune to anti-war charities.
Split into simpler sentences: The original was sent to Mary in London, who decrypted the code using a book that Holmes had noticed in Moriarty's office during their first meeting. Mary passes the information to Inspector Lestrade who seizes Moriarty's assets, and donates Moriarty's fortune to anti-war charities.