You can choose to deploy Squad Crull and Squad Galatael as a single unit called a Kill Team. This counts as a single unit for all game purposes. The Kill Team cannot split up during the battle, even if a model within it has the Independant Character special rule.
Building an army? Create, validate and share your list with New Recruit, army builder for Warhammer 40,000 7th Edition and many more games.
Try the builder