The phrase "also asserted that an" is correct and usable in written English.
It can be used when introducing a statement or claim made by someone, often in the context of reporting or discussing opinions or findings.
Example: "The researcher also asserted that an increase in temperature could lead to significant changes in the ecosystem."
Alternatives: "also claimed that an" or "also stated that an".
They also asserted that a prolonged and bitter strike in the mid-1990's had played a big role.
The three also asserted that a black male juror announced during deliberations that he did not like other blacks, saying, "Look at what they are capable of".
The article also asserted that a former Liechtenstein prime minister had assembled a network of banks, government workers and lawyers to help organized crime.
The report also asserted that a Swiss investment manager had made "thinly veiled" threats to a bank employee after learning that one of the bank's Madoff-linked investments could lose value.
Those critics also asserted that a ready made was not a valid act of personal imagination, that it was 'just' an object that the artist didn't even own".
We've lost four of our diplomats, and what is the signal that our government is sending to the rest of the world?" Just as quickly as he alluded to Mr. Carter's biggest foreign policy crisis, Mr. Ryan also asserted that a Romney-Ryan administration would follow a strategy of "peace through strength" – an equally plain reference to the national security motto Mr. Reagan favored.
She also asserted that a "third person" may have been responsible for the death, according to Human Rights Watch.
But we also asserted that a pardon was premature and that he should return to the United States to face the charges against him and make a case for leniency.
The FDA also asserted that a website for Unilever Inc.'s Lipton Green Tea 100% Naturally Decaffeinated made a health claim by linking consumption of green tea to reduced cholesterol for people at risk of heart disease.
She also said Mandela's wife, Winnie, was an "embarrassment" to the group because she "never does as she is instructed". She also asserted that a leadership struggle between two young guerrilla leaders, Chris Hani and Thabo Mbeki, is likely whenever President Oliver Tambo steps down.
