Engineers scale their vehicles down in size, whereas insect-flight researchers enlarge and slow the wings to a more manageable size and speed.
(Engineers; scale down; their vehicles) (insect-flight researchers; enlarge; ) (insect-flight researchers; slow; the wings; to a more manageable size and speed)
Engineers insect-flight researchers insect-flight researchers
scale down enlarge slow
their vehicles
the wings to a more manageable size and speed