Complex sentence: At Rameswaram, the Sunrise was not visible due to thick cloud all around the sky, but it started getting clear at around 9 AM local time and became almost totally clear by the time the eclipse began.
Split into simpler sentences: At Rameswaram, the Sunrise was not visible due to thick cloud all around the sky. But it started getting clear at around 9 AM local time and became almost totally clear by the time Eclipse began.