Complex sentence: "Dridu" villages of the lowlands east of the Carpathians were abandoned between 1050 and 1080, around which time new settlements appeared on higher land on both banks of the Prut.
Split into simpler sentences: Dridu villages of the lowlands east of the Carpathians were abandoned between 1050 and 1080. Around the same time new settlements appeared in higher places on both banks of the Prut.