(2) As students learn science skills, they identify components of the solar system including the sun, planets, moon, an asteroids and learn how 
(students; learn; science skills) (they; identify; components of the solar system including the sun, planets, moon, an asteroids) (they; learn; how)
students they they
learn identify learn
science skills
components of the solar system including the sun, planets, moon, an asteroids
how