Complex sentence: It should be noted that this occurred during the First Punic War that pitted Rome against Carthage: the Etruscans and Carthaginians were traditional allies (see Battle of Alalia).
Split into simpler sentences: It should be noted that this occurred during the First Punic War that pitted Rome against Carthage. In addition, we recall that the Etruscans and Carthiginians were traditional allies (see Battle of Alalia).