Complex sentence: On arrival, they learn Shinzon is a clone of Picard, secretly created by Romulans to plant a high-ranking spy into the Federation, but the project was abandoned when he was still a child and he was left on Remus to die as a slave.
Split into simpler sentences: On arrival, they learn Shinzon is a clone of Picard, secretly created by Romulans to plant a high-ranking spy into the Federation. The project was abandoned when he was still a child and he was left on Remus to die as a slave.