Complex sentence: In Moldavia, agriculture and animal raising remained the principal economic activities, but the establishment of the principality enhanced the security of travel, thus Moldavia could also profit from the transit trade between Poland and the Black Sea ports.
Split into simpler sentences: In Moldavia, agriculture and animal raising remained the principal economic activities. The establishment of the principality enhanced the security of travel, thus Moldavia could also profit from the transit trade between Poland and the Black Sea ports.