Today's grammar point is -tara and -nara, both of which form conditional phrases. Tara is a subordinate conjunction. In English, this roughly corresponds to "when," "if" and "after." Nara is the hypothetical form of the da copula, which expresses the speaker's supposition about the truth of a present or past fact or the actualization of something in the future.
I'm sure I'll be able to learn Japanese once I become an English professor so I can understand explanations like these.
Maybe write them in plain English?