Complex sentence: This crab species is large enough that it can inhabit a fully-grown shell of "Eustrombus gigas" and indeed this crab will attack and eat a conch, thus obtaining a meal and a shell.
Split into simpler sentences: This crab species is large enough that it can inhabit a fully-grown shell of "Eustrombus gigas". The crab will attack and eat a conch, thus obtaining a meal and a shell.