Every six months these nodes line up with the Sun's direction and solar eclipses become possible at the time of New Moon.
(these nodes; line up; ) (Every six months these nodes line up with the Sun's direction and solar eclipses; become; possible; T:at the time of New Moon)
these nodes Every six months these nodes line up with the Sun's direction and solar eclipses
line up become
possible T:at the time of New Moon