Complex sentence: Luttrell stumbles upon a small body of water and submerses himself only to find upon surfacing that a local Pashtun villager Mohammad Gulab has discovered his location and takes Luttrell into his care where they return to Gulab's village and attempts to hide Luttrell in his home.
Split into simpler sentences: Luttrell stumbles upon a small body of water and submerses himself only to find upon surfacing that a local Pashtun villager, Mohammad Gulab, has discovered his location. Gulab takes Luttrell into his care, returning to his village, where he attempts to hide Luttrell in his home.