The phrase "and asserts that if" is correct and usable in written English.
It can be used when introducing a conditional statement or hypothesis in a discussion or argument.
Example: "The researcher presents a theory and asserts that if the conditions are met, the results will be significant."
Alternatives: "and claims that if" or "and maintains that if".
However, Fulljames does make one major qualification: he sees Mahagonny responding to capitalism as a cyclical process and asserts that if the city of rampant pleasure and concomitant commoditisation is currently to be found anywhere on earth, it's in China, which he describes as being "at the beginning of the story".
Lamenting the horrors of the war, Goldfield computes its total monetary cost at around $6.7 billion in 1860s currency, and asserts that if "the government had purchased the freedom of four million slaves and granted a 40-acre farm to each slave family, the total cost would have been $3.1 billion, leaving $3.6 billion for reparations to make up for a century of lost wages.
This Note addresses the constitutionality of these proposals and asserts that if the Supreme Court's current Fourth Amendment jurisprudence is taken to its logical extremes, warrantless searches in public housing can be found constitutional.
Syrian officials denied having used chemical weapons and asserted that if such weapons had been used, rebel forces were to blame.
Instead, they assume, and assert, that if, say, Geithner is against nationalizing the banks, he is either stupid or corrupt, when it seems more likely that he's just reached a different conclusion about the risks and rewards of nationalization.
Mr. Khan's lawyers and family deny the accusations and assert that if he confessed to such crimes, he did so falsely under harsh interrogation tactics that amounted to torture.
The Syrian opposition accused pro-Assad forces of having carried out the attacks, but Assad denied having used chemical weapons and asserted that, if such weapons had been used, rebel forces were to blame.
When that happens, his team members stand up for him and assert that if Alan is fired, they are leaving too.
During his remarks, Young reaffirmed the depth and strength of his Christian faith, and asserted that if elected, "I would invite New York Senator Chuck Schumer to lunch so that I could share the good news of Jesus Christ" with him.
Richard is portrayed as suffering a pang of conscience, but as he speaks he regains his confidence and asserts that he will be evil, if such needed to retain his crown.
The Electronic Frontier Foundation criticised the IWF's reasoning: The IWF continues to assert that the image is indeed child porn, and asserts that the image would be blocked if it were on a British server.
