Complex sentence: In May 2002 City Sightseeing acquired its biggest rival Guide Friday, leading to the absorption of the Guide Friday Edinburgh fleet into the main fleet, leaving Lothian as the only tour operator in the city.
Split into simpler sentences: In May 2002 City Sightseeing acquired its biggest rival Guide Friday. This led to the Guide Friday Edinburgh fleet being absorbed into Lothian, leaving Lothian as the only tour operator in the city.