Complex sentence: She also mentioned that a client, who had worked with her before the show, wanted to book her but got a refusal because she was busy and an offer to book Sara Nuru (winner cycle 4) instead of Miriam.
Split into simpler sentences: She also mentioned that a client who had worked with her before the show wanted to book her but got a refusal because she was busy. The client was offered to book Sara Nuru (winner cycle 4) instead of Miriam.