Complex sentence: Gwen Stefani and Alicia Keys will not be returning as coaches, instead they will be replaced by Miley Cyrus, who returns after taking a one season hiatus along with returning coaches Adam Levine and Blake Shelton.
Split into simpler sentences: Gwen Stefani and Alicia Keys will not be returning as coaches. Instead, they will be replaced by Miley Cyrus, who returns after taking a one-season hiatus along with returning coaches Adam Levine and Blake Shelton.