Depending on what the manufacturer it is? Most standard A/C system you are not allowed to split into a line set as the freon will take the easiest way and one air handler may not get enough and will freeze up. There are several manufacturers that make what is called a mini split with two to four indoor air handler and one condensing unit but with these they all have a seperate line set for each indoor unit.
Most likely the split into the line set was a joe homeowner's handi work.

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Well thats my 2 cents.
Brian Kelly
Kelly Home Inspections