Complex sentence: In Pakistan many fanciers and associations organize endurance competitions, in Rawalpindi/Islamabad All Pakistan Pigeons Lovers Association organizes the bi-annual competitions once in Sep/Oct and Once in May.
Split into simpler sentences: In Pakistan many fanciers and associations organize endurance competitions. In the Rawalpindi-Islamabad area, the All Pakistan Pigeons Lovers Association organizes two competitions one in September or October and one in May.