Complex sentence: It was eventually relieved of its remaining television/radio payloads in July 2006 by Astra 1KR, although due to 1C's favourable condition compared to the failing Astra 1E, it is likely to remain on station until the launch of Astra 1L.
Split into simpler sentences: It was eventually relieved of its remaining television/radio payloads in July 2006 by Astra 1KR. It is likely to remain on station until the launch of Astra 1L.