Complex sentence: Benny is involved in Chris' credit card fraud scheme with Mohammed and Ahmed, using his relationship with Martina to get numbers used at Nuovo Vesuvio and selling them on through Soprano crew associate Murmur.
Split into simpler sentences: Benny is involved in Chris' credit card fraud scheme with Mohammed and Ahmed. Benny uses his relationship with Martina to get numbers used at Nuovo Vesuvio and sells them on through Soprano crew associate Murmur.