Complex sentence: Other smaller groups made their way to Debrecen and the Banat regions of the Kingdom of Hungary, to what is now Hungary and Serbia; the Kingdom of Hungary recruited Germans to repopulate areas along the Danube River decimated by the plague and the Ottoman invasion.
Split into simpler sentences: Other smaller groups made their way to Debrecen and the Banat regions of the Kingdom of Hungary, to what is now Hungary and Serbia. The Kingdom of Hungary recruited Germans to repopulate areas along the Danube River decimated by the plague and the Ottoman invasion.