Complex sentence: Some large riverboats are comparable in accommodation, food service, and entertainment to a modern oceanic cruise ship, although (on the Yangtze) typically employing staff for double duties and both dining serving staff and as evening costumed dancing entertainers.
Split into simpler sentences: Some large riverboats are comparable in accommodation, food service, and entertainment to a modern oceanic cruise ship. On the Yangtze River, they typically employ staff for double duties: both as serving staff and as evening-costumed dancing entertainers.