Complex sentence: The conspirators killed one of his chief councillors, Budó; shortly afterwards Peter was obliged to slip away to the court of his brother-in-law, Adalbert, Margrave of Austria.
Split into simpler sentences: The conspirators killed one of his chief councillors, Budó. Shortly afterwards, Peter was obliged to slip away to the court of his brother-in-law, Adalbert, Margrave of Austria.