Favored by the Ancient Egyptians as a source of turquoise, the Sinai was, until recently, famed for only one event but certainly an important one.
( ( Favored ( by ( ( the ( Ancient Egyptians ) ) ( as ( ( a source ) ( of turquoise ) ) ) ) ) ) ( , ( ( the Sinai ) ( ( ( was ( ( , ( ( until recently ) , ) ) famed ) ) ( for ( ( ( only ( one event ) ) ( but certainly ) ) ( an ( important one ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (VBG Favored) (PP (IN by) (NP (NP (DT the) (JJ Ancient) (NN Egyptians)) (PP (IN as) (NP (NP (DT a) (NN source)) (PP (IN of) (NP (NN turquoise))))))))) (, ,) (NP (DT the) (NNP Sinai)) (VP (VBD was) (ADJP (PRN (, ,) (SBAR (IN until) (FRAG (ADVP (RB recently)))) (, ,)) (JJ famed)) (PP (IN for) (NP (NP (RB only) (CD one) (NN event)) (CONJP (CC but) (RB certainly)) (NP (DT an) (JJ important) (NN one))))) (. .)))
The Ancient Egyptians found nothing of use in the Sinai.  
( ( The ( Ancient Egyptians ) ) ( ( ( found ( nothing ( of use ) ) ) ( in ( the Sinai ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ Ancient) (NN Egyptians)) (VP (VBD found) (NP (NP (NN nothing)) (PP (IN of) (NP (NN use)))) (PP (IN in) (NP (DT the) (NNP Sinai)))) (. .)))