This is the 3687th most frequent Dutch word.
slaagden
"Slaagden" is the past tense plural form of "slagen," meaning "succeeded" or "passed."
Here, 'slaagden' is used in the context of successfully accomplishing something.
De studenten slaagden erin om het examen te halen.
The students succeeded in passing the exam.
In this sentence, 'slaagden' indicates achieving success in an endeavor.
In de jaren '50 slaagden de Nederlanders erin om een economische wederopbouw te realiseren.
In the 1950s, the Dutch succeeded in achieving an economic recovery.
This usage of 'slaagden' again conveys success in reaching a goal.