Complex sentence: When a car bomb explodes outside one of Komarov's pharmaceutical companies, and a virus is stolen from inside, an investigation by the FSB ensues headed by FSB agents Sonia Astrova (Annika Peterson) and Andrei Kasanov (Niko Nicotera).
Split into simpler sentences: When a car bomb explodes outside one of Komarov's pharmaceutical companies, and a virus is stolen from inside, an investigation by the FSB ensues. Heading the investigation are FSB agents Sonia Astrova (Annika Peterson) and her colleague Andrei Kasanov (Niko Nicotera).