The structure expresses 'if it is said that ~, then it can be said that ~' or '~ not only, but also ~'.
Long explanation:
This grammar point is used to highlight two comparable facts and thus to underline the parallelism or likeness between them. The meaning can be roughly translated into English as 'If it is said that ~, then it can also be said that ~' or '~, not only, but also ~'.