Question

is that the pronoun in the sentence given Kevin realise soon enough that the bank he was carrying was not his

Answer 1

he is the pronoun in this sentence

Answer 2

Hey!

Its me Sheena here!

So whats a pronoun?

Pronoun is a word which is used in place of the noun.

For example:

Neeta is a good girl. Neeta plays cricket. Neeta is a good dancer. Neeta sings well.

So here everytime using a the same noun again and again is irrelevant.

So we use a pronoun that is 'She'

It is fine only to use Neeta once.

So using pronoun:

Neeta is a good girl. She plays cricket. She is a good dancer. She sings well.

So after using pronoun our sentence looks proper and appropriate. 

So coming to your question>>>

Is 'that'the pronoun in the sentence given Kevin realise soon enough that the bank he was carrying was not his

So, 'that' is considered as a relative pronoun because it relates about a pronoun.

The correct pronouns will be>>>

He and His

Because they are used in the place of nouns.

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Hope this helps!