Complex sentence: Thus highlighting the risk involved in venturing in the process that is the brain drain, not only in terms of the cost to the labourer socially and financially, but also the weakening of their supposed labour power.
Split into simpler sentences: Thus highlighting the risk involved in venturing in the process that is the brain drain. Not only in terms of the cost to the labourer socially and financially, but also the weakening of their supposed labour power.