two predicates in one sentence?

Next, previous work shows, the scout recruits a new scout to join her on a trek to the good site. She dashes around tapping her antennae on other ants and releasing a pheromone from her sting gland, explains Stephen Pratt of Arizona State University in Tempe. Usually she finds a volunteer within a minute or so, and the two set off tandem running.

Please help me comprehend why two predicates, shows and recruits, were used in one sentence by the author ? I think a period should’ve been used here.