Complex sentence: Androgynous docking (and later androgynous berthing) in contrast has an identical interface design on both spacecraft, allowing system-level redundancy (role reversing) as well as rescue and collaboration between any two spacecraft vehicles.
Split into simpler sentences: Androgynous docking (and later androgynous berthing) by contrast has an identical interface on both spacecraft. This allows system-level redundancy (role reversing) as well as rescue and collaboration between any two spacecraft vehicles.