def weird_gen(s):
    s = [s]
    while s:
        *x, a = s[0].split(',', 2)
        y, *s = a.split('\n', 1)
        yield ', '.join(z.strip().replace('\n', ' ') for z in x + [y])

print('\n'.join(weird_gen(open('bad.csv').read())))

1, "asdsdsdsds", "John"
2, "dfdhifdkinf dfjdfgkdnjgknkdjgndkng dkfdkjfnjdnf", "Roy"
3, "dfjfdkgjfgn", "Rahul"