“in the last 3 months” - I guess this term should be used with past simple. The time period is already gone. E.g. now is february and if I say "in the last 3 months", I mean "in november, december and january". The term “in the past 3 months" shows the period which is not finished yet. So there should be used the present perfect.

Gerunds: Gerunds are often used when actions are real, concrete, or completed. For example: I stopped smoking. (The smoking was real and happened until I stopped.) Infinitives: Infinitives are often used when actions are unreal, abstract, or future. For example: I stopped to smoke. (I was doing something else, and I stopped; the smoking had not happened yet.)

Se conoce como conquista musulmana de Hispania​ o etapa musulmana inicial de la península ibérica​3​ al complejo proceso político y militar que a lo largo del principio del siglo viii explica la formación y consolidación de al-Ándalus, así como la génesis de los principales reinos cristianos medievales peninsulares. tengo informacion pero cobro gracias sera minimo