Complex sentence: The Trek line was developed in the late 1980s with some early model prototypes and the first official model year beginning in 1991 and ending 2001 under the Safari Motorcoach Corporation banner.
Split into simpler sentences: The Trek line was developed in the late 1980s with some early model prototypes. The first official model year began in 1991 and ended in 2001 under the Safari Motorcoach Corporation banner.