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When you try to explain a complex theory, stringing together short sentences often creates choppy, repetitive prose. Instead of writing "The team found a result. The result surprised everyone," you can fuse the entire finding directly into the subject position: "What the team discovered surprised everyone."
An embedded noun clause is a subordinate clause—meaning it has its own subject and verb—that functions syntactically as a single noun within a larger main clause.
How do you place an entire sentence-level thought into the primary driver seat of your sentence?

Noun Clauses as Grammatical Subjects

A subject noun clause takes the spot before the main predicate verb, acting as the primary actor or concept. It typically begins with a subordinating marker such as that, what, whether, how, or why.
Notice how starting with "That the algorithm exhibits systematic bias" treats the entire factual situation as a singular concept. Because the whole clause functions as one singular unit, it takes the singular main verb remains.
What happens when you move that embedded clause to the receiving end of a verb?

Direct Objects and Predicate Nominatives

When an embedded clause follows a transitive action verb, it acts as a direct object, receiving the verb's action. When it follows a linking verb like is, seems, or remains, it acts as a predicate nominative (also called a subject complement), renaming or defining the subject.
In academic writing, pairing an abstract noun subject like hypothesis, assumption, or finding with a linking verb and a predicate nominative lets you define exact claims without vague pronouns.