The word supuso is the preterite form of suponer in the third person singular.
See the full suponer conjugation

suponer

La aprobación de la resolución 1820 (2008) supuso un hito.
The adoption of resolution 1820 (2008) was a landmark achievement.
La Directiva 2004/22 supuso un paso importante en esta dirección.
Directive 2004/22 was an important step in this movement.
La formación de las colecciones supuso años de trabajo intenso.
The formation of the collection took years of intense work.
Conseguir esos poderes supuso un momento histórico para el Parlamento Europeo.
Getting those powers was a historic moment for the European Parliament.
Una visita saludable que supuso un auténtico reto para los sentidos.
A visit that was a real challenge for the senses.
La primera fase, supuso su preparación y ejecución.
The first phase, involved its preparation and execution.
La reciente campaña presidencial no supuso unas elecciones legítimas.
The recent presidential campaign was not a legitimate election.
Sí, Nairobi supuso "un paso adelante" en la preparación del terreno.
Yes, Nairobi was 'a step forward' in preparing the ground.
No tienes ni idea de lo que supuso para mí.
You have no idea what this did to me.
Sin embargo la fabricación del último modelo no supuso su declive.
However the production of the final model didn't assume its decline.
No sabes lo que supuso para mi, Eddie.
You don't know what that did to me, Eddie.
Vino aquí porque supuso que mi hermano le ayudaría.
He came here because my brother was supposed to help him.
Ello supuso una disminución del 3,8% con respecto al bienio anterior.
That represented a 3.8 per cent decrease over the previous biennium.
El TUE también supuso un pequeño paso preliminar hacia la unión política.
The TEU also represented a modest preliminary step towards political union.
Desafortunado, pero supuso que esas cosas eran necesarias.
Unfortunate, but he supposed such things were necessary.
La instalación de este sistema supuso todo un desafío.
The installation of the solution was quite a challenge.
El saneamiento financiero supuso mucho más trabajo del que se había previsto.
Financial clean-up entailed significantly more work than had been anticipated.
La experiencia con la descentralización supuso una gran diferencia a ese respecto.
Experience with decentralization clearly made a difference in that regard.
Se supuso que esto era a beneficio de toda la humanidad.
It was supposed to be for the benefit of all mankind.
Quizá supuso que tenía derecho a un poco de felicidad.
Maybe she figured she had a right to a little happiness too.
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