What is the effect of Hawthorne including so many dependent clauses in the sentence that begins "it may seem marvellous"?

The dependant clauses are meant to illustrate Hester's freedom and confinement. Hester is free to run away back to Europe but she feels compelled to confine herself to her little cabin in a town that has marked her disgrace.

It may seem marvellous, that, with the world before her,—kept by no restrictive clause of her condemnation within the limits of the Puritan settlement, so remote and so obscure,—free to return to her birthplace, or to any other European land, and there hide her character and identity under a new exterior, as completely as if emerging into another state of being,—