The word razonaban is the imperfect form of razonar in the third person plural.
See the full razonar conjugation

razonar

En resumen, razonaban al unísono y trabajaban juntos.
So, they reasoned in unison and operated together.
Todo esto se desarrolló lentamente; los salvajes no razonaban conscientemente sobre estos problemas.
This was all a slow development; the savage did not consciously reason about such problems.
Las ONG razonaban también que el turismo en Turquía podría resultar afectado negativamente, ya que la aprobación de esta ley pone en peligro los paisajes naturales vírgenes que son los que realmente atraen a los veraneantes.
The NGOs also reasoned that tourism in Turkey might also be badly affected, since the act would undermine the unspoilt natural beauties of the coast that attract holidaymakers in the first place.
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