Splitting an API string then splitting the value of one of the object values

Noob struggling... I have an API call that I'm breaking into 4 value array's. One of the value arrays has to be split in to 16 values and formatted. I then need to put it back in to one array to inject in to Influxdb. I can't figure out how to get the two messages back in to a single array. Not sure if I'm not formatting the join properly or what. Thanks in advance..

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I have made this flow work with a single point set but can't get it working doing a multiple point call.