сначала было тяжело, так как фирм б

сначала было тяжело, так как фирм было много и у каждой была своя особенность

Результаты (английский) 1:

at first it was hard, because there were many firms and each had his own feature

Результаты (английский) 2:

at first it was difficult because there were many firms and each had its own feature

Результаты (английский) 3:

At first it was difficult, as firms have been many and each had their own special feature