Second-fifth graders will be building their own simple circuits (with batteries, wires, and mini flashlight bulbs) and will be testing various substances for conductivity.
(Second-fifth graders; will be building; their own simple circuits) (Second-fifth graders; will be testing; various substances; for conductivity)
Second-fifth graders Second-fifth graders
will be building will be testing
their own simple circuits
various substances for conductivity