Complex sentence: A policeman, Karl Deckert, overheard him saying that he would like to meet Hitler personally, and advised him that a private audience could be arranged if Bavaud could obtain a letter of introduction from a suitable foreign VIP.
Split into simpler sentences: A policeman, Karl Deckert, overheard Bavaud saying that he would like to meet Hitler personally. Deckert advised Bavaud that a private audience could be arranged if Bavaud could obtain a letter of introduction from a suitable foreign VIP.