I know it combines 3 different lines and a noticeable grammatical break(kireji).
but from yugong's haiku above, I couldn't find the obvious grammatical break even though it does have 3 lines.
I read most of your haikus, which have 3 lines but actually only 2 complete sentences. usually 1st sentence takes 2 lines with a BREAK between them.
however, I did find some haikus this afternoon that can contain 3 complete sentences, 1 sentence each line.