Complex sentence: Pierre is then persuaded by Grigoriev to continue cooperating without telling Jessica; he will accept neither money nor defection as a reward, but sometimes requests small gifts like a Sony Walkman and Queen cassette tapes for his son, some cognac, or books of French poetry.
Split into simpler sentences: Pierre is then persuaded by Grigoriev to continue cooperating without telling Jessica. He will accept neither money nor defection as a reward, but sometimes requests small gifts, like a Sony Walkman and Queen cassette tapes for his son, some cognac, or books of French poetry.