Would you be able to draw a rough sketch of the configuration you saw and attach it to the Chat Window?
The vertical struts transfer load from the roof rafters down to a bearing wall. This strut reduces the span of the roof rafters, thus allowing you to use shallower depth rafters.
The struts on the other side look similar to a modified scissor truss, see link below:
It is hard to tell if they are doing anything structural or if they are there to frame in a ceiling.
Just an FYI, here are the requirements for Braced Rafters:
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