Phrases and clauses analysis! Help me please!!!

Hi Eveybody!

I'm an Italian student and the next week I'm taking an exam about the phrases and clauses analysis of an article.

I'm a lot of perplexities about this kind of exercise and I'd like if you could help me.

• Is it right the analysis of this sentence? : [In [April NP] PP] [ Japan's Government NP] [Caused VP] [anger NP] When (conj ???) [It Np (and Dummy Subject)] [raised VP] [The [Upper AdjP ?] [Limit NP] NP] [Of [Safe NP] [Radiation NP] [explosure NP] PP] [For [Children NP] PP] [From [1 (Determiner?) Millisievert NP] [A year NP]pp] [To [20 MsV NP] [a year NP] PP], [the [same AdjP][ Level NP] NP] [[the[international AdjP][Commission NP] NP] [on [radiological AdjP][protection NP]PP]NP] [Recommends VP] [For [[[nuclear NP] [Plant NP] AdjP] [Workers NP] NP]PP].
• Are "WHEN" and "WHERE" considered as Conjuncions? "AS" too? Can they introduce a relative clause or what else? For example, in the last sentence : " [...] When it raised the upper limit of safe radiation exposure for children... [...]" Can I consider it as a... relative clause? Nominal relative clause? Temporal clause? =S
• Then, the word "Millisievert" (unit of dose equivalent radiation) is a LOAN WORD from Science area?

Thanks a lot for your help! I hope someone would answer and help me!

Greetings from Italy!