Complex sentence: On 3 April 1077 emperor Henry IV granted the county of the Friuli, with ducal prerogatives, to Sigaerd, Patriarch of Aquileia, whichi n the following centuries expanded to control also Trieste, Istria, Carinthia, Styria and Cadore.
Split into simpler sentences: On 3 April 1077 the Emperor Henry IV granted the county of the Friuli, with ducal prerogatives, to Sigaerd, Patriarch of Aquileia. The patriarchate in the following centuries expanded its control over neighbouring Trieste, Istria, Carinthia, Styria, and Cadore.