Complex sentence: Major Magnus accuses Moon of being the madman, since he is not the real Inspector Hound, but it is too late, Moon recognizes Magnus as Puckeridge, the third-string critic, and he tries to run but is shot.
Split into simpler sentences: Major Magnus accuses Moon of being the madman, since he is not the real Inspector Hound. Too late, Moon recognizes Magnus as Puckeridge, the third-string critic, and he tries to run but is shot.