Being a German mastering the English language and having to read specialist literature in both languages for business reasons, it is likely ....
I am referring especially to the first part of the sentence...
Being a German mastering the English language and having to read specialist literature in both languages for business reasons, it is likely ....
I am referring especially to the first part of the sentence...
Although this "rule" (it's not really a grammatical rule but a stylistic suggestion) is often broken by native speakers, you want an opening clause like yours to modify the subject of the main clause; your main clause begins with "it".
Also, you don't need being.
As a German (who is) mastering the English language and having to read specialist literature in both languages for business reasons, I ...
Here's an example of a "dangler":
As someone who likes good beer, please have plenty of it in the fridge when I come to visit.
Better:
As someone who likes good beer, I hope to find plenty of it in the fridge when I come to visit.
This might seem rather forward. Imagine you're saying it to your brother, and that you indulged his penchant for pepperoni pizza when he came to visit you.