had been frequenting
Past perfect progressive conjugation of frequent. There are other translations for this conjugation.

frequent

Many had been frequenting the place for years and saw it as not only a bookstore but a space to share ideas, creative energy and thought.
Muchos han estado frecuentando el lugar durante años y lo veían como algo más que una librería, como un lugar en dónde compartir ideas, energía creativa y reflexiones.
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