"Glenn Close stepped on the stage to honor the academy members who sadly passed away this evening."
"Glenn Close stepped on stage this evening to honor the academy members who, sadly, [had] passed away."
The big, confusing deal here is the misplacement of the adverbial phrase "this evening," describing at what time Ms. Close STEPPED onto the stage. The deceased, obviously, did not pass away on the night of the Oscars. Two past tenses are needed here. The earlier past action must employ the auxiliary verb "had" to indicate an action previous to another, namely, the deceased HAD DIED before Ms. Close STEPPED onto the stage. BTW, I would say that she stepped on stage, rather than on the stage, as the former is treated like an expression. There is no need to specify through the direct article the a particular stage as distinct from all others.
Sheesh! Enuf already!!!!!!!!!!
The disjunct sadly -- not essential to the sentence -- must be set off by commas.
THANKS!
CC