Complex sentence: Following Tuđman's election and the perceived threat from the new constitution, Serb nationalists in the Kninska Krajina region began taking armed action against Croatian government officials, many of whom were forcibly expelled or excluded from the SAO Krajina.
Split into simpler sentences: Following Tuđman's election and the perceived threat from the new constitution, Serb nationalists in the Kninska Krajina region began taking armed action against Croatian government officials. Many were forcibly expelled or excluded from the SAO Krajina.