A shift in thought can be indicated by what is called an em dash. An em dash is used to set of an interruption that is closely relevant to
the sentence but is not grammatically part of it. These set of
interruptions can be found in a list, illustration, restatement, shift
in thought or tone, summary, or dramatic point.
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Answer:
The brothers’ ability to overcome difficulties to succeed as scholars.
Explanation:
The excerpt begins by informing us of the difficult personal problems and the meager financial support that the brothers faced from 1805 to 1812. It also highlights that, despite these problems, the brothers could prove themselves as innovative scholars in German philology. Therefore, that the author introduces is the brothers’ ability to overcome difficulties to succeed as scholars.