Complex sentence: RV Tauri variables are also often considered to lie on the instability strip near the Cepheids; although they are a very different type of star, their pulsations have been shown to be due to the same basic mechanism.
Split into simpler sentences: RV Tauri variables are also often considered to lie on the instability strip near the Cepheids. Although they are a very different type of star, their pulsations have been shown to be due to the same basic mechanism.