As Clark had taught them, they had to look closely because sometimes the color would be merely a part of the stamen or under a leaf.
(Clark; had taught; them) (they; to look closely; because sometimes the color would be merely a part of the stamen or under a leaf) (the color; would be; merely a part of the stamen or under a leaf; T:sometimes)
Clark they the color
had taught to look closely would be
them
because sometimes the color would be merely a part of the stamen or under a leaf
merely a part of the stamen or under a leaf T:sometimes