Complex sentence: After the assassination of Sancho Garcés IV of Navarre, Vizcaya, Álava, La Rioja and the royal family recognized Alfonso VI of Castile and Leon as king; thus passed Miranda de Ebro into the hands of the Kingdom of Castile in 1076.
Split into simpler sentences: After the assassination of Sancho Garcés IV of Navarre, Vizcaya, Álava, La Rioja and the royal family recognized Alfonso VI of Castile and Leon as king. This event passed Miranda de Ebro into the hands of the Kingdom of Castile in 1076.