Original sentence: ) All mainstream forms of Judaism today are open to sincere converts.For instance, if a person who converted through the Conservative movement wished to be considered Jewish by most Orthodox rabbis, he or she would need to convert again with the supervision of an Orthodox rabbi and "Beit Din" (literally, "House of Judgement"—in this case, a group of affiliated rabbis who supervise the conversion process together).More orthodox sects of Judaism often refuse to recognize as valid conversions performed by more liberal sects
Edited sentence: )  Contrary to popular belief, there are today no mainstream forms of Judaism that refuse sincere converts.For instance, if a person who converted through the Conservative movement wished to be considered Jewish by most Orthodox rabbis, he or she would need to convert again with the supervision of an Orthodox rabbi and "Beit Din" (literally, "House of Judgement" - in this case, a group of affiliated rabbis who supervise the conversion process together).It is true, however, that more orthodox sects of Judaism do often refuse to recognize as valid conversions performed by more liberal sects