Complex sentence: Whilst the lower (therefore second) hieroglyphic sign is for sure a "Ka"-symbol, the other sign is illegible, because the excavator, Alessandro Barsanti, made no facsimiles, but frouzy hand-drawings, so that the last sign is undefinable.
Split into simpler sentences: Whilst the lower (therefore second) hieroglyphic sign is for sure a "Ka"-symbol, the early sign is illegible. Unfortunately the excavator, Alessandro Barsanti, made no facsimiles, but slipshod hand-drawings, so that the last sign is undefinable.