Complex sentence: Completely unsure of what they would discover, they armed themselves with a revolver.Edwin was the first to enter, as he was the smallest The Morgan brothers' initial expedition was halted at a large lake, which they later managed to cross by coracle.
Split into simpler sentences: Completely unsure of what they would discover, they armed themselves with a revolver.Edwin was the first to enter, as he was the smallest of the Morgan brothers. Initial expedition was halted at a large lake, which they later managed to cross by coracle.