Err... a sentence is the same in pretty much every language, though. It is a complete thought with a start and a finish. Japanese sentences tend to be either much shorter than in English (because of no need for a subject), or much longer (because of the ease of which a person can add extra information and implications to a sentence without breaking grammatical law). In Japanese music, this means we tend to see a lot more of the longer type sentences (i.e. while a 4-line verse in an English song is popularly 4 separate sentences, it might be only 2 or 1 in a Japanese song), because it has a nicer flow. Most words in Japanese are 2, 3, or 4 syllables, whereas most words in English are 1 syllable, so instead of having 4 2-word sentences making up 4 lines, they more often create fuller, more poetic lines than we tend to in English, by making 1 big long sentence.

Does that make any sense?

Basically, in the case of JEWEL, Ayu sets up the first half of the sentence by saying "The fact that I welled up with tears...", and she finishes up the sentence in the last line by saying "...was because you were nice". The rest is all embellishments, extra information, and emotional filler, to make that sentence sound more beautiful and poetic.

I was wondering the same thing, actually! I hope it has different levels, Ayu's best songs, IMO, have several levels like that. Dearest, ever free, M, HEAVEN, CAROLS. <-- all good use of different levels of orchestration.