Complex sentence: Mark sends longtime family servant Fritz Keller (Felix Bressart) to collect the coffin, but the American's nervousness raises the suspicion of the political police and he is brought to the camp for questioning.
Split into simpler sentences: Mark sends longtime family servant Fritz Keller (Felix Bressart) to collect the coffin. However, the American's nervousness raises the suspicion of the political police and he is brought to the camp for questioning.