Milankovich cycles are small, slow but regular changes in the Earth's orbit round the Sun, and the tilt of the Earth's axis.
(Milankovich cycles; are; small, slow but regular changes in the Earth's orbit round the Sun, and the tilt of the Earth's axis)
Milankovich cycles
are
small, slow but regular changes in the Earth's orbit round the Sun, and the tilt of the Earth's axis