PowerShell export multiple objects as csv - powershell

Question

I have two columns of data the first is a string array the second is actually an object. I am looking for a simple way of exporting this as a csv. I have a version with a foreach loop that builds each string up but it seams like over kill. I have been trying to use select and select object to get it out somehow. Note I am just a beginner at powershell so I may be missing something.
My first attempt:
$data | Select-Object -ExpandProperty reports | Select -ExpandProperty data | Select -ExpandProperty rows | Format-Table $_.dimensions
Results in:
dimensions metrics
---------- -------
{New Visitor, "Mozilla} {#{values=System.Object[]}}
My second one went as far as looping
foreach ($report in $data.reports) {
"Rows:" + $report.data.rows.Count
foreach ($row in $report.data.rows) {
$output = ""
foreach($dim in $row.dimensions) {
$output += $dim + $seporator
}
foreach($met in $row.metrics) {
foreach($v in $met.values) {
$output += $v + $seporator
}
}
#| Out-File -Append C:\Users\linda_l\Documents\debug.txt
$output
}
}
There is a potential for a lot of data here so I would really like to avoid the string building solution.
Note: Data comes from the Google Analytics reporting api
$data = Invoke-RestMethod -ContentType 'application/json' -Uri "https://analyticsreporting.googleapis.com/v4/reports:batchGet?access_token=$($token.access_token)" -Method POST -Body $analyticsRequest
reports : {#{columnHeader=; data=}}
From comment:
$data | Export-Csv -Path "C:\Users\linda_l\Documents\debug2.csv"
System.Management.Automation.PSCustomObject reports System.Object[]
Optimal output csv
New Visitor,S40 Ovi Browser,1,2
New Visitor,Safari,3,4
Note its up on Github steps for getting a refreshtoken
Data is coming from the Google analytics reporting API