Complex sentence: Originally, Nicole Scherzinger (lead singer of The Pussycat Dolls) was approached to make a guest appearance on the record, but was forced to decline because she already was signed to a contract with Eden's Crush.
Split into simpler sentences: Originally, Nicole Scherzinger (lead singer of the Pussycat Dolls) was approached to make a guest appearance on the record. She was forced to decline because she already was signed to a contract with Eden's Crush.