"and that could have serious implications for the rate at which the seas rise."
what type of sentence is this? is it a compound sentence because of the use of the subcoordinating conjunction "and" at the beginning of the sentence?

The details about the statues, i believe, are that they're carved from blocks of igneous stone, many of them are partially buried under the ground which to preserve and protect them from the harsh environment on easter island, and many of the facial features have washed away. also, the most well-preserved one is at the british museum in london.these are just guesses from what i can see and what i think i read correctly. i'm sorry i couldn't be more .