Complex sentence: Lyme disease (Lyme borreliosis) is an infectious disease caused by at least three species of bacteria belonging to the genus "Borrelia", transmitted via the bite of an infected tick.
Split into simpler sentences: Lyme disease (Lyme borreliosis) is an infectious disease caused by at least three species of bacteria belonging to the genus "Borrelia". It is transmitted via the bite of an infected tick.