Complex sentence: In 2000, Matt Rossell, an animal rights activist posing as a laboratory technician released video footage taken from inside the Oregon National Primate Research Center, accusing the facility of violating federal laws and ignoring signs of distress among the rhesus monkeys housed there.
Split into simpler sentences: In 2000, Matt Rossell, an animal rights activist, posed as a laboratory technician, then released video footage taken from inside the Oregon National Primate Research Center. He accused the facility of violating federal laws and ignoring signs of distress among the rhesus monkeys housed there.