Complex sentence: Guerin claimed he was doing this for the US govornment, but was disowned, and was eventually convicted and sentenced to 15 years for defrauding Ferranti of $1.1 billion, money laundering and illegal arms exports.
Split into simpler sentences: Guerin claimed he was doing this for the US government, but this was disavowed. He was eventually convicted and sentenced to 15 years for defrauding Ferranti of $1.1 billion, money laundering and illegal arms exports.