Complex sentence: A fanfare trumpet is a brass instrument similar but longer to a trumpet and is capable of playing specially composed fanfares for major national and international events, the extra length can also accomodate a small ceremonial banner which can be mounted on it.
Split into simpler sentences: A fanfare trumpet is a brass instrument similar to but longer than a trumpet, capable of playing specially composed fanfares. Its extra length can also accommodate a small ceremonial banner that can be mounted on it.