Question

The nerves that controlled his muscles were shutting down. Identify the type of clause

Answer 1

The nerves that controlled his muscles : Main Clause

were shutting down : Subordinate Clause.

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Answer 2

The answer is: the clause is here is the adjective clause.  

The clauses of the sentence are the nerves that controlled his muscles were shutting down.

Here the adjective clause is qualifying the noun hence it is an adjective clause.

Nerves are controlling the muscles, which means it is qualifying the noun.

Besides the principal clause, the adjective clause  is functional in the sentence.