In the text:
"Wenn die Risiko-Ermittlung zu Zeiten in denen sie andere Personen getroffen haben aktiv war, kann die Berechnung des Infektionsrisikos f眉r diesen Zeitraum erfolgen."
there are commas missing and "sie" is not capitalized to refer to the second person plural.
Below for comparison, the text on the left from a device where the app was installed more than 14 days ago, and on the right from a device where the app was installed more recently.

The text should be grammatically correct.
This concerns the string risk_details_information_body_period_logged_assessment_over_14_days https://github.com/corona-warn-app/cwa-app-android/blob/25a18cfd65783846e8df84b21cbf305fc6298434/Corona-Warn-App/src/main/res/values-de/strings.xml#L311
https://mentor.duden.de/ suggests adding commas, and changing "sie" to "Sie" leads to:
"Wenn die Risiko-Ermittlung zu Zeiten, in denen Sie andere Personen getroffen haben, aktiv war, kann die Berechnung des Infektionsrisikos f眉r diesen Zeitraum erfolgen."
This however seems a little awkward. Please consider using instead the longer text from risk_details_information_body_period_logged_assessment_under_14_days https://github.com/corona-warn-app/cwa-app-android/blob/25a18cfd65783846e8df84b21cbf305fc6298434/Corona-Warn-App/src/main/res/values-de/strings.xml#L309
"Das Infektionsrisiko wird f眉r Zeitr盲ume berechnet, in denen die Risiko-Ermittlung aktiv ist. Wenn Sie andere Personen getroffen haben und die Risiko-Ermittlung aktiv war, wird Ihr Infektions-Risiko berechnet."
I found the same string in the iOS repository, so I assume the issue affects both Android and iOS.
Internal Tracking ID: EXPOSUREAPP-6204
@MikeMcC399 Thanks. Internal Tracking ID: EXPOSUREAPP-6204
The issue is resolved in CWA Android 2.0.3.

I will leave this issue open temporarily in case there is any feedback from the iOS implementation, although I assume that due to https://github.com/corona-warn-app/cwa-app-ios/pull/2364 the issue is also fixed in the iOS release.
Confirm fixed under iOS too.
Thanks to @Ein-Tim for iOS checking.
Now closing.
@MikeMcC399 @Ein-Tim Thanks!