Complex sentence: These underground rumours were propagated by, among others, Giuliano della Rovere, and the family was frequently described as marranos by political opponents: the rumours persisted in popular culture for centuries, listed as such for example in the "Semi-Gotha" of 1912.
Split into simpler sentences: These underground rumours were propagated by, among others, Giuliano della Rovere, and the family was frequently described as marranos by political opponents. The rumours have persisted in popular culture for centuries, listed as such for example in the "Semi-Gotha" of 1912.