The phrase "also asserted that in" is correct and usable in written English.
It can be used when you want to indicate that someone has made a claim or statement in addition to previous assertions, often in a formal or academic context.
Example: "The researcher also asserted that in her study, the results indicated a significant correlation between the variables."
Alternatives: "also claimed that in" or "further stated that in".
And on Thursday, American officials also asserted that, in a gun battle that took place during the seizure operation in the early morning of May 11, no Americans had fired weapons, only the Honduran police on the ground and a Honduran door gunner in a helicopter.
He also asserted that in order to protect the health and welfare of the people, integration must be opposed.
The Justice Department also asserted that in the last four years officers killed 23 people and wounded 14 others in incidents that were case studies in irresponsibility.
They also asserted that, in uremic patients, oral iron is unlikely to keep pace with iron demand, rendering the response to erythropoietin suboptimal.
B49a, by contrast, contradicts the claim that one can step into the same rivers (and also asserts that claim), and B91[a], like Plato in the Cratylus, denies that one can step in twice.
It also asserts that in the interest of "consciously creating an American myth" and "a patriotic legend," Longfellow "took liberties with history".
Taking this one step further, the strategy also asserts that in the context of globalization, poor health 'does more than damage the economic and political variability of any one country - it is a threat to the economic and political interests of all countries' [[ 1], p. 7].
You also asserted that we in Congress "misunderstand both the organisation and its reforms".
But the report also asserted that improvements in battlefield medicine, evacuation practices and the armor and design of vehicles were saving more troops — and thus returning more survivors to the United States with serious injuries.
He also asserted that Trump knew in advance that WikiLeaks planned in July 2016 to release a batch of emails damaging to Hillary Clinton.
Sulimankhail also asserted that no one in the family believed that Rahman had been involved in Al Qaeda — and that if, for the sake of argument, his uncle had been, why was Rahman dead while Khalid Sheikh Mohamed, the self-described mastermind of the 9/11 attacks, was alive and in prison?
