Complex sentence: It is documented to feed directly on seagrasses (rather than algae epiphytes like many other seagrass associated snails), with its diet shifting between the two disjunct areas of its distribution.
Split into simpler sentences: It is documented to feed directly on seagrasses (rather than algae epiphytes like many other seagrass associated snails). Its its diet is different in the two disjunct areas of its distribution.