Complex sentence: Nana and all four of her nani (Grandmother) Qamar Sultana's brothers were all Army men and since her Nani was a second mother to her, she grew up surrounded by them.
Split into simpler sentences: Nana and all four of her nani (grandmother) Qamar Sultana's brothers were Army men. Since her nani was a second mother to her, Jamil grew up surrounded by them.