Complex sentence: The dense bunches of these grasses also provide cover for small animals such as the rare Botteri's Sparrow ("Aimophila botterii"); lovegrasses may be ground cover of key importance on oceanic islands like Laysan, where other plants are rare.
Split into simpler sentences: The dense bunches also provide cover for small animals such as the rare Botteri's Sparrow ("Aimophila botterii"). Lovegrasses may be important groundcover on oceanic islands like Laysan, where other plants are rare.