Complex sentence: The aircraft's lower fuselage will be assembled on the A330 final assembly line, and then be moved to another facility for the year-long process of assembling the upper fuselage and the lowered nose fuselage.
Split into simpler sentences: The aircraft's lower fuselage will be assembled on the A330 final assembly line. It will then be moved to another facility for the year-long process of assembling the upper fuselage and the lowered nose fuselage.