Original sentence: He, however has so far been unable to test the 2009 car, due to testing restrictions, and has appealed for special permission to test.It remains to be seen if Schumacher will drive at Valencia as there are concerns if his neck is strong enough
Edited sentence: It remains to be seen if Schumacher will drive at Valencia as there are concerns his neck is not strong enough.So far, he has been unable to test the 2009 car, due to testing restrictions and has appealed for special permission to test