You can read them as separate statements with the middle repeated and a logical AND between them:
If (8.5p1 <= your OpenSSH version) AND (your OpenSSH version < 9.8p1) Then you are vulnerable
It’s the same as saying if your OpenSSH version is between these two versions (including 8.5p1, but not 9.8p1), then you are vulnerable
What do you mean by “backed” here? I think I’m misunderstanding but I thought (and a short google seems to confirm) that currency A being backed by currency B means the value of A is fixed at a certain amount of currency B, and there is some organisation “backing” this with reserves.
Not trying to shill/defend crypto, just confused on terminology :)