Complex sentence: Cumberbatch was legally entitled to conduct the civil partnership ceremony because of his online Universal Life Church ministerial ordination, and Rinder later became one of three best men at Cumberbatch's wedding to Sophie Hunter in 2015.
Split into simpler sentences: Cumberbatch was legally entitled to conduct the civil partnership ceremony because of his online Universal Life Church ministerial ordination. Rinder was one of three best men at Cumberbatch's wedding in 2015.