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The way in which simplicity comes in from supposing that there really are physical objects is easily seen. If the cat appears at one moment in one part of the room, and at another in another part, it is natural to suppose that it has moved from the one to the other, passing over a series of intermediate positions.
[Problems of philosophy - Bertrand Russell, Chapter II]
What does "comes in" in the text above mean?
Many thanks!
In this context, come in means the same thing it means in other contexts: to enter.
Because this is a philosophical text, usages can sometimes be a little strange or erudite. Here Russell subtly anthropomorphizes "simplicity," talking about it like it was an active thing or even a person.
Supposing that there are real physical objects allows simplicity to come in to or enter your mind (or perhaps to enter the situation or logical context).
