Complex sentence: Northern Waterthrushes nest in a stump or among tree roots, laying three to six eggs (cream-or buff-colored, with brown and gray spots) in a cup nest of leaves, bark strips, and rootlets.
Split into simpler sentences: Northern Waterthrushes nest in a stump or among tree roots, laying three to six eggs, which are cream-or buff-colored, with brown and gray spots. These eggs are laid in a cup nest constructed of leaves, bark strips, and rootlets.