Complex sentence: Despite the name, "keyboard percussion" instruments do not have keyboards as such, in fact keyboard instruments such as the celesta and keyboard glockenspiel are excluded from the percussion section owing to the very different skills required to play them.
Split into simpler sentences: Despite the name, "keyboard percussion" instruments do not have keyboards as such. Keyboard instruments such as the celesta and keyboard glockenspiel are not included in the percussion section owing to the very different skills required to play them.