Complex sentence: Parveen had already begun performing at Dargahs and Urs in the early 1970s, but it was in 1973, on Radio Pakistan, that that she achieved her first real breakthrough with the Sindhi song Tuhinje zulfan jay band kamand widha.
Split into simpler sentences: Parveen had already begun performing at Dargahs and Urs in the early 1970s, but it was in 1973, on Radio Pakistan, that that she achieved her first real breakthrough. Her first hit was the Sindhi song Tuhinje zulfan jay band kamand widha.