[wittneben]

It seems to me, from my naive eyes, that the heart of the verse should read:

και προσηνεγκαν αυτω παντας τους...παραλυτικους.

Is it possible that the long interjection, with multiple participles, was added afterward, although Matthew could have been his own editor?
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The Kingdom of the Living God

[Obadiah]

It's possible, but I don't see any real motivation for it.

The syntax is a bit clumsy, but that's hardly unusual in the NT.