This sentence means, roughly:
Section 2(b) is concerned with legal interests created by a disposition of land, in cases where the title to that land is registered.
To understand why, let's try to turn the following sentence into a wh-relative clause with the antecedent "land":
The title to the land is registered.
We want to replace "the land" with the relative pronoun "which" and move it to the start of the clause. Now, when the relative pronoun is an object of a preposition at the end of the subject, you can't move the relative pronoun on its own. So this would generally be considered incorrect:
* land which the title to is registered
Instead, you need to move the enclosing prepositional phrase in its entirety:
land to which the title is registered
This is straightforward, but may be somewhat awkward, since it isn't clear whether the prepositional phrase "to which" is modifying "the title" or "registered." Note that "registered" here is an adjective, not a passive voice verb; presumably it means that the land is in the registry of some government agency. Of course, we aren't talking about cases where the title is registered to the land (which would make no sense), but about cases where the title to the land is registered. This is why "land (that) the title’s registered to" is incorrect; if you phrased it that way, "to" would be modifying "registered."
So, particularly in very formal style, you can move not just the prepositional phrase "to which" but its enclosing noun phrase "the title to which" to the start of the relative clause:
land the title to which is registered
That's exactly what you see in the sentence you provided, though the surrounding context may make it less obvious that this is just an ordinary relative clause.
This sounds horrible. But I can (kind of) see why they wrote it that way. You could also say "land whose title is registered," but one would typically say "the title to the land," not "the land's title," so "whose title" is a bit strange.
(My source for the above is Huddleston & Pullum (2002), but I've simplified things greatly and avoided their annoying terminology.)