With this sentence you could write it as:
I had a discussion with Jone at his home back in 2018, about the
impacts of climate change on the poor, which had a profound impact on
The main part would be what you did and what it caused, the rest would be the relative side info.
The information that goes in the relative clause. You can try removing different parts of a sentence to see if you can still get the main point you want across.
What is the focus? Who you talked with, what it was about, what it meant? Depending on that, the sentence could be either:
I had a discussion about the effect of climate change on the poor that
had a profound impact on me.
I had a discussion with my friend Jone about climate change that had a
profound impact on me.
The rest goes in the relative clause which can be removed entirely if it's not important to you.