You could split it into an array of many instead of just two, splitting on all the periods. Then combine the first 4 back into 1 string, and all the remainder into another.
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string bob = "asd.wetr.wrt6y.sdfg.edgh";
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string[] bobArray = bob.Split(new char[]{'.'},5);//2nd param is max number of splits so this will make 4 little parts at each period, then leave the rest as the 5th big part.
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string Part1 = bobArray[0] + bobArray[1] + bobArray[2] + bobArray[3];// brute force but meant for demonstrative purpose
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string Part2 = bobArray[4];
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