Coordinating conjunctions are used to link simple sentences. They have no effect on the word order. Here's an example using aber:
Ich mag Brot. Ich hasse Milch. – I like bread. I hate milk.
If you join these two sentences with aber, they look like this:
Ich mag Brot, aber ich hasse Milch. – I like bread, but I hate milk.
The conjunction sondern means 'but', but it is used differently from aber.
It is used in a sentence where you are either contradicting or negating what the first sentence says. So sondern could be translated more literally as 'but instead' or 'but rather'.
Hilfsvokabeln - Helpful vocabulary
Practise using coordinating conjunctions.
Join the two sentences with the conjunction given. What does the longer sentence mean in English?