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How do I handle a sentence in which I would normally have two が? For example,
彼がその本を読んでる。
彼はその話題があまり分からん。
are normal sentences with slight distinction in meaning between が and は there, but what if I want a typical subject to use with 分かる?
彼がその話題が分からん
This doesn't work with two が, but I swear I hear this phrase often as
彼がその話題を分からん
Maybe I'm just mishearing, but is it possible to turn a second が into を for grammatical fit? Or are there other ways to express a が subject with a が verb?
The following four sentences are all valid.
As for the difference between 彼は and 彼が, the former is the normal particle choice, as you probably know. If you use が here, it will carry an exhaustive-listing meaning. See: What's the difference between wa (は) and ga (が)?
As for the difference between その話題が分からない and その話題を分からない, they mean the same thing, but the former is still considered more standard. Some expressions including 好き, 分かる, ～(ら)れる and ～たい sometimes take を, but it's difficult to make a clear distinction, and the level of acceptance varies from person to person. See the following questions for details.
When exhaustive-listing が is involved, you can safely use two が's in one sentence, and just because there are two が's doesn't mean you have to replace the second が with を.
