Complex sentence: On August 1,1927, the uyezds and governorates were abolished and Ostrovsky District, with the administrative center in Ostrov, was established as a part of Pskov Okrug of Leningrad Oblast.
Split into simpler sentences: On August 1,1927, the uyezds were abolished, and Ostrov became the administrative center of Ostrovsky District. The governorates were abolished as well, and the district became a part of Pskov Okrug of Leningrad Oblast.