Complex sentence: Some participants use radio direction finding equipment and antennas mounted on a vehicle, whereas others use antennas that are temporarily deployed in an open window or an opening in the vehicle roof that can be easily rotated by hand while the vehicle is in motion.
Split into simpler sentences: Some participants use radio direction finding equipment and antennas mounted on a vehicle. Others use antennas that are temporarily deployed in an open window or an opening in the vehicle roof, and that can be easily rotated by hand while the vehicle is in motion.