syntax problem

I haven't made progress with any of my conlang sketches. The latest has an interesting agreement system. What I'm stuck on is this: it has both independent explicit subject with absolute tense forms and dependent coreferential subject with relative tense forms. The independent forms are used in main clauses and the dependent ones are used attributively and as secondary predicates. The problem is that adjunct clauses need explicit subjects with relative tenses and I haven't come up with the syntax that can do this (without adding more forms).

I haven't proven Fermat's theorem either.

a verb morphology scheme

Verbs can be transitive or intransitive; the 2 types of forms are dependent and independent. Independent forms are made from stems marked for absolute tense, while dependent forms are made from stems marked for alignment and relative tense.

Pronouns: 1S, 1XP, 1NP, 2S, 2P, and various 3rd person noun classifiers.
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PREPOSITIONAL VERBS

Prepositional verbs are like intransitive verbs, but have an additional argument which is placed immediately after the verb. This argument isn't marked on the verb.