Complex sentence: SonoSim, Inc. is a software development company based in Santa Monica, California that designs and manufactures an ultrasound training and education product, which is based on didactic instruction, knowledge assessment, and a virtual ultrasound simulator.
Split into simpler sentences: SonoSim, Inc. is a software development company based in Santa Monica, California. The company designs and manufactures a computer-based ultrasound training and education product, which is composed of didactic instruction, knowledge assessment, and a virtual ultrasound simulator.