Complex sentence: Certain tattoo pigments, such as yellows, greens and fluorescent inks are more challenging to treat than darker blacks and blues, because they have absorption spectra that fall outside or on the edge of the emission spectra available in the tattoo removal laser.
Split into simpler sentences: Certain tattoo pigments, such as yellows, greens and fluorescent inks are more challenging to treat than darker blacks and blues. These pigments are more challenging to treat because they have absorption spectra that fall outside or on the edge of the emission spectra available in the tattoo removal laser.