Complex sentence: They well then be moved to another facility for the year-long process of assembling the upper fuselage, and the lowered nose fuselage; the first Beluga XL will enter service in 2019.
Split into simpler sentences: They well then be moved to another facility for the year-long process of assembling the upper fuselage, and the lowered nose fuselage. The first Beluga XL will enter service in 2019.