The phrase "demonstrated afterward" is grammatically correct and can be used in written English.
It means to show or prove something after a certain event or action has taken place. Example: The scientist conducted her experiments and then demonstrated afterward how her findings confirmed her hypothesis.
The patient went ahead with the gall bladder operation that the medical director had refused to approve, and tests afterward demonstrated that the procedure had in fact been necessary.
Selective contrast injections in the celiac trunk afterward demonstrated stasis of contrast in the splenic artery, indicating successful embolization (Fig. 3).
He demonstrated his focus soon afterward.
Empathy reduces prejudice and racism: In one study, white participants made to empathize with an African American man demonstrated less racial bias afterward.
The results also showed that students who played Activate during a five-minute warm up scored better on a separate educational video game immediately afterward, demonstrating that video games can be an essential tool to get kids ready to learn before class.
Soriano dived to his right, realized he might not reach the ball, and as he extended his glove hand, Soriano used the sides of his left hand to nudge the glove out farther on his fingers -- something he began doing this year, he said afterward, demonstrating with his glove.
Still, several audience members yelled out "Spasiba!" (thank you) after the film was shown, and dozens lined up to sign petitions afterward, demonstrating the kind of grass-roots interest that has put pressure on leaders and other figures.
He said afterward that the failure demonstrated how hard it was to achieve dramatic change without a crisis to force it.
Afterward we answered questions and demonstrated musket-firing techniques for the several hundred locals and tourists who'd come out to see our encampment.
Some of those who attended the Harvard sessions as observers said afterward that the Trump team demonstrated more competence and skill as they discussed what happened than some of the caricatures of the operation as the contest was unfolding.
Davis' mastery of demography, demonstrated in his editing of World Population in Transition (1945) and afterward, became an increasingly important analytic tool.
