I'm not surprised you're confused! I'm not a lawyer, but I'll have a bash. Perhaps someone more knowledgeable will put me right!
The last part says that there are prohibitions & restrictions contained in the lease, & that dealings with those prohibitions & restrictions "inter vivos" are not allowed. "Inter vivos" means between living persons & I fail to see the relevance of that phrase in this context - you are hardly likely to have dealings between or involving dead persons!
The first part says that if anyone does have dealings involving the prohibited or restricted matters they cannot be registered on the title. I assume this means that, as they cannot become part of the title, they cannot be enforced.
I'm afraid I cannot understand why this clause is there. If the lease contains prohibitons & restrictions then I would have thought it would not be possible to register any matter which breached them - whether this clause existed or not.