Sertorius originally earned their trust during his benevolent term as governor of Hispania.
He built up a formidable army of Spaniards by being sympathetic to them
and by exploiting their superstitions.
ad bellum ... Hispanias:
Not the typical translation of commovere with bellum
because the object is Hispanias and not bellum. Translate
not as "to begin" a war but rathered "to move" to war.
qui interempti erant:
While the first qui refers to Sertorius, this second qui
refers to ceterorum, "the rest."
Q. Caecilius Metellus... et L. Domitius:
Sertorius defeated Q. Caecilius Metellus in the town of Lacobriga (79-78 BCE).
filius eius, qui...vicit:
It was the father of Q. Caecilius Metellus (Pius) — Q. Caecilius Metellus Numidicus — who had conquered Jugurtha.
A ... Hirtuleio:
Domitius was killed in the town of Consabura. For a simpler order, take a look at: a Hirtuleio (duce Sertorii). What is the effect of the word order Eutropius chose here?
vario successu:
"with varied (i.e. some good, some not so good) outcome" AblMan