This is the 3423rd most frequent Spanish word.
elaborados
"Elaborados" means "elaborated" or "produced/made with care or detail."
In this sentence, 'elaborados' is used as a past participle functioning as an adjective, describing 'planes' to indicate they were created or prepared with detail.
Los planes estaban elaborados con gran detalle.
The plans were elaborated with great detail.
Here, 'elaborados' is again a past participle used as an adjective, describing 'productos' to indicate that they were crafted manually.
Compramos unos productos elaborados artesanalmente.
We bought some handcrafted products.
'Elaborados' in this sentence is part of the passive voice construction, referring to 'argumentos' and indicating they were prepared or developed thoroughly.