Complex sentence: In August 2010, Russian authorities arrested ten individuals who had been connected to WinLock, a ransomware which displayed pornographic images and asked users to send a premium-rate text message costing around US $10 to receive a code which can unlock their machines.
Split into simpler sentences: In August 2010, Russian authorities arrested ten individuals who had been connected to WinLock. Instead, WinLock trivially restricted access to the system by displaying pornographic images, and asked users to send a premium-rate SMS (costing around US $10) to receive a code that could be used to unlock their machines.