Complex sentence: The world's oceans are a very noisy environment due to naturally occurring sounds like volcanic eruptions and fault-line shifts, these naturally occurring acoustical signals have been happening for millennia and as such the marine species have adapted to them.
Split into simpler sentences: The world's oceans are a very noisy environment due to naturally occurring sounds like volcanic eruptions and fault-line shifts. These acoustical signals have been happening for millennia and as such the marine species have adapted to them.