"Martin thinks he is a cat"
Martin is the subject and thinking he is the cat is the predicate, right ?
Is there ever such a thing as a sentence with "is" more than once, but only one subject and predicate ?
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"Martin thinks he is a cat."
This exactly equivalent to "Martin thinks that he is a cat"
'that' is a relative pronoun.
'[that] he is a cat' is a subordinate clause.