Complex sentence: By February 2015, after the flip of KHHT from rhythmic oldies to urban contemporary, KTWV began adding more classic soul and current R&B songs to fill the void of KHHT's departure; at the same time, most of the mainstream AC pop crossovers were dropped.
Split into simpler sentences: By February 2015, after the flip of KHHT from rhythmic oldies to urban contemporary, KTWV began adding more classic soul and current R&B songs to fill the void of KHHT's departure. At the same time, most of the mainstream AC pop crossovers were dropped.