insertaban
-they were inserting
The word insertaban is the imperfect form of insertar in the third person plural.
See the full insertar conjugation

insertar

De acuerdo con mi estudio lo insertaban dentro de los programas de entretenimiento.
According to the research I did, they inserted them into the entertainment programs.
El Sistema de Archivo de Documentos (SAD), por otra parte, era el depositario electrónico exclusivo para los textos definitivos en todos los idiomas oficiales, que siempre se insertaban en él simultáneamente.
The Official Document System (ODS), on the other hand, was the sole electronic repository for the definitive texts in all official languages, which were always posted on it simultaneously.
La encuesta de inserción laboral empezó con los graduados, pero las universidades enseguida manifestaron la necesidad de conocer también la opinión de los empleadores sobre los recién graduados universitarios que se insertaban en el mundo laboral.
The graduate employment outcomes survey first began with the graduates, but the universities promptly expressed an additional need for information on the opinion of employers regarding the employability and skills of recent graduates entering the world of work.
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