Sabes_K has it best, but here’s my update to what Sabes suggested,

“Learning that his son Allen plagiarised his essays pushed Ethan to the limit and made all the past events unbearable. ”

A little parallel structure NEVER went TOO far. Your original version has ZERO parallel structure.

How’s this for a rewrite:

Ethan is pushed to the limit when he learns that Allen, his son, has plagiarized his essay. All past events are now unbearable to him.

(Personally I’d like to just eliminate that last sentence. I don’t know what you’re driving at. Does context make it ok?)

Second sentence:

This is the place that Ethan goes to before any big change occurs. Stopping there on Good Friday, he wonders–is a life-changing event about to occur?

“This is the place where Ethan goes before any big change occurs. Therefore, when he stops there on Good Friday, a life changing event is sure to occur.”

The two sentences in the second example can be correctly condensed into only one by making full use of the conjunction ‘therefor’ by putting a comma after the word occurs and writing ‘therefor’ without a capital letter at the beginning. This sentence makes perfect sense also.

Oh, and sentence is not spelled with an A.