Complex sentence: Whilst still a major, MacQueen presented a specimen of a bustard species he had shot to the British Museum (Natural History) and the bird was subsequently named for him as the Macqueen's Bustard, "Chlamydotis macqueenii".
Split into simpler sentences: Whilst still a major, he presented a specimen of a bustard species he had shot to the British Museum (Natural History). The bird was subsequently named for him as the Macqueen's Bustard, "Chlamydotis macqueenii".