Breakdown of El gerente anda investigando la causa debido a las quejas.
las
the (feminine plural)
el gerente
the manager
investigar
to investigate / to research
la queja
the complaint
Questions & Answers about El gerente anda investigando la causa debido a las quejas.
Why is it debido a here instead of debido a que?
You use debido a because it is followed directly by a noun phrase (las quejas). If you wanted to follow it with a conjugated verb, like "due to the fact that they complained", you would need the que to connect the clauses: debido a que se quejaron.
Why use anda investigando instead of está investigando?
Could I use por culpa de instead of debido a in this sentence?
Is the noun quejas related to the verb quejarse?
Exactly. The reflexive verb quejarse means to complain, making las quejas the direct noun equivalent: the complaints.