The phrase "also prove that they" is correct and usable in written English.
It can be used when discussing evidence or arguments that support a claim or assertion about a group or individuals.
Example: "The researchers conducted several experiments that also prove that they can improve cognitive function."
Alternatives: "additionally demonstrate that they" or "further establish that they".
We also prove that they correspond to decision rules based on virtual surplus maximization, together with the appropriate incentive taxes.
The growers competing for the five licenses must also prove that they have money to back their businesses.
Oxford demands that students who meet its academic targets for study must also prove that they have liquid assets to cover fees, which can reach £41,000, plus £12,900 in living costs.
Colleges and universities seek students who not only take the correct steps in high school, but who also prove that they can make an impact in their field.
This legislation further stipulates that any transgender person must also prove that they have not stored any of their gametes (eggs or sperms) in sperm banks for future use.
Similarly, we can also prove that (3.19).
Taiwanese firms have also proved that they can adapt existing technology cleverly to come up with new products.
Again these revealed microplastics but also proved that they had increased substantially since the 1960s, alongside our production and consumption of plastic.
These days, they're also proving that they're happy to ditch all the bells and whistles offered by a corporate hotel chain (bell-hops, trouser presses and the like) in return for personality at a great price.
Their confidence, however, has been lifted considerably by the mature display against Scotland, when Wales controlled possession for long periods and also proved that they are capable of winning without Bale.
But, their time at the Taste also proved that they had a large appeal for all frozen treat lovers as well.
