I missed out the attachment and read it now. I am really surprised a person claiming to be an Architect and already working cannot understand such plain Englsh given by your HR Department regarding study leave.
Apparently, you are very weak in understanding English. You can show it to some person who can read, understand and explain to you in a language you can understand. If you cannot understand such simple english also, how you think you can study LLB? Better not.
Now the contents of your attachment are quite clear stating that Study leave cannot be sanctioned for more than 12 months at a time and in any case not more than 24 months. Since LLB is not a course which can be copleted in 24 months, you cannot avail the leave. Further, your area of specialisation is architecture and your organisation may not give permission for specialisation in Law, but its a matter of taking decision by your HR. Please approach your HR instead of wasting your and our time here in the forum.