that skins comes as a welcome , if downbeat , missive from a forgotten front 
(ROOT (S (NP (IN that) (NNS skins)) (VP (VBZ comes) (PP (IN as) (NP (NP (DT a) (ADJP (JJ welcome) (, ,) (SBAR (IN if) (FRAG (ADJP (JJ downbeat)))) (, ,)) (NN missive)) (PP (IN from) (NP (DT a) (VBN forgotten) (NN front))))))))
(ROOT (S (NP (IN ) (NNS )) (VP (VBZ ) (PP (IN ) (NP (NP (DT ) (ADJP (JJ ) (, ) (SBAR (IN ) (FRAG (ADJP (JJ )))) (, )) (NN )) (PP (IN ) (NP (DT ) (VBN ) (NN ))))))))