die Trennung
separation
The ending of a romantic relationship or marriage.
Die Trennung von seiner langjährigen Freundin fiel ihm sehr schwer.
The separation from his long-term girlfriend was very hard for him.

separation
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separation
The ending of a romantic relationship or marriage.
Die Trennung von seiner langjährigen Freundin fiel ihm sehr schwer.
The separation from his long-term girlfriend was very hard for him.

'Die Trennung' (separation) is a noun derived from the verb 'trennen' (to separate). The ending '-ung' is often used to form a noun from a verb that describes the action or the result of that action.
Man muss den Müll sorgfältig trennen.
You have to separate the waste carefully.
'Die Trennung' is almost always used with the preposition 'von' and the dative to express what or who is being separated. This pattern applies to all meanings.
Die Trennung von ihrem Partner war schmerzhaft.
The separation from her partner was painful.
You can tell what kind of 'Trennung' is meant from the object after the preposition 'von'. If it refers to a person, it is about a relationship. If it refers to things, it is about separation. If it refers to concepts, it is about a basic distinction.
Die Trennung von den Kindern fiel ihr schwer.
The separation from the children was hard for her.
The word 'Trennung' is part of many important compound nouns. A very everyday example is 'die Mülltrennung' (waste separation), meaning the separation of waste.
In Deutschland ist die Mülltrennung gesetzlich vorgeschrieben.
In Germany, waste separation is required by law.
connection / association
'die Verbindung' and 'die Trennung' are often opposites. A connection brings things, places, or people together, for example technically, professionally, or socially. A separation means that things or people move apart or are separated from each other. With people, 'Trennung' can especially mean the end of a relationship or marriage. Put simply: a connection creates closeness or contact; a separation breaks that contact, or distance arises.

Die Trennung fiel ihr schwer, weil sie viele Jahre mit ihm zusammen war.
The separation was hard for her because she had been with him for many years.
Nach der Nachricht blieb die Verbindung zwischen den beiden Teams eng.
After the news, the connection between the two teams remained close.