What does Numbers 9:21 mean?

And sometimes the cloud was from evening until morning; and when the cloud was taken up in the morning, they journeyed: or if it continued by day and by night, when the cloud was taken up, they journeyed.

And so it was, when the cloud abode from even unto the morning, and that the cloud was taken up in the morning, then they journeyed: whether it was by day or by night that the cloud was taken up, they journeyed.

And sometimes the cloud was from evening until morning; and when the cloud was taken up in the morning, they journeyed: or if it continued by day and by night, when the cloud was taken up, they journeyed.

And sometimes the cloud was there only from evening to morning; and when the cloud was taken up in the morning they went on their journey again: or if it was resting there by day and by night, whenever the cloud was taken up they went forward.

And so when the cloud is from evening till morning, when the cloud hath gone up in the morning, then they have journeyed; whether by day or by night, when the cloud hath gone up, then they have journeyed.

If the cloud tarried from evening until morning, and immediately at break of day left the tabernacle, they marched forward: and if it departed after a day and a night, they took down their tents.

And if it were so that the cloud was there from the evening until the morning, and that the cloud was taken up in the morning, then they journeyed; or a day and a night, and the cloud was taken up, they journeyed;