Complex sentence: These fish are named for their barrel-shaped, tubular eyes which are generally directed upwards to detect the silhouettes of available prey; however, according to Robison and Reisenbichler these fish are capable of directing their eyes forward as well.
Split into simpler sentences: These fish are named for their barrel-shaped, tubular eyes which are generally directed upwards to detect the silhouettes of available prey. However, according to Robison and Reisenbichler these fish are capable of directing their eyes forward as well.