Однако если у таксистов серого веще

Однако если у таксистов серого вещества прибывало, то в случае гаджетов его, наоборот, убывает.

Results (English) 1:

However, if taxi drivers gray matter were, in the case of his gadgets, on the contrary, decreases.

Results (English) 2:

However, if the taxi arrived gray matter, in the case of his gadgets, on the contrary, it decreases.

Results (English) 3:

If, however, the taxi drivers gray matter had originated, in the event his gadget, on the contrary, decreases.