thatの解釈
次の文章の【 】部分がわかりません。thatが2回出てきているのですがどう解釈すればよいでしょうか。訳と解説をお願いします。
参考：Mysticism: A Guide for the Perplexed by Paul Oliver
https://books.google.co.jp/books?id=X1QSBwAAQBAJ&pg=PA139&dq=%22+THAT+SOMETIMES+,+IF%22&hl=ja&sa=X&ved=0ahUKEwjY1u3uyuTaAhXEKpQKHeBFCwo4ChDoAQhUMAY#v=onepage&q=%22%20THAT%20SOMETIMES%20%2C%20IF%22&f=false
Just as nature has found mechanisms to maintain a form of equilibrium, human beings are adapted by both their physiology and psychology to maintain a form of equilibrium. The various biochemical feedback mechanisms and control systems ensure that if one element of the body's physiology alters, other processes can often manage to adapt so that the overall condition of the body does not change. In other words, the body reacts to restore the natural equilibrium. Similarly, in the case of psychological difficulties the body is able to adapt. We are able to learn strategies to cope with problems, and not necessarily to overreact to them. 【We learn throughout life, that sometimes if we can manage to live with a difficult situation, and to give the circumstances time to change, that this is exactly what happens.】 Even seemingly very difficult situations will often gradually improve, given time. When we look back on an event which seemed extremely difficult at the time, it is often quite amazing that it has gradually improved, sometimes without any specific intervention. Of course, this does not always happen, but there are many occasions on which it does. In other words, as human beings, our lives and our relationships with other human beings are also in a type of dynamic equilibrium.
お礼
そうだったのですね。 まさか、「その」とは思っていなかったです。 助かりました。