Complex sentence: The usual staple of an étouffée is crawfish (crayfish), whereas shrimp or crabmeat are more often found in gumbos.
Split into simpler sentences: The usual staple of an étouffée is seafood such as crawfish (crayfish), shrimp, or crabmeat. Shrimp and crabmeat are, however, more often found in gumbos.