Forked Lightning targets 1 creature or conjuration (see target line at the top) and has the Sweeping trait, which allows it to attack a second target after the first, in the same zone as the first.
Unfortunately because this card is from Academy, they added redundant text to the card, which only adds confusion. I recommend pretending there is no text on this card.
*edit* In fact, if they replaced the words "and can" with "which allows it to", then it would be clear... but the ambiguous use of the word "and" makes it more confusing than it needs to be.