Complex sentence: A number of submerged shoals are visible on the north and southeast sides of the island in the Hariabhanga estuary, indicating that the total area of South Talpatti Island will surpass 25 to 30 sq km within the next one or two decades.
Split into simpler sentences: A number of submerged shoals are being visualised on the north and southeast side of the island near the Hariabhanga estuary. These data indicate that the total area of South Talpatti Island will surpass 25 to 30 sq km within the next one or two decades.