Original:  Jana Kessler (Martina Straessler, Jara Weiss as a child, and Jasmin Tabatabai as adult Jana), in 1939 five years old, has been snatched from her parents , and the following years she's consigned to a life of orphanages and foster homes, in order to sever her ties with her culture and to 'assimilate' Jana to a 'better way of life'.
Revised:  Jana Kessler (Martina Straessler, Jara Weiss as a child, and Jasmin Tabatabai as adult Jana), in 1939 five years old, has been snatched from her parents and consigned to a life of orphanages and foster homes, in order to sever her ties with her culture and to 'assimilate' Jana to a 'better way of life'.
Edit intent: coherence