Complex sentence: Like the elves, they have a significantly longer lifespan than humans and are cross-fertile with them (although Kerr has indicated that elves and dwarves are not directly cross-fertile with each other); they likewise share the elven ability to see in the dark.
Split into simpler sentences: Like the elves, they have a significantly longer lifespan than humans and are cross-fertile with them. They likewise share the elven ability to see in the dark.