If you can find a way of showing the information you are looking for in the Google analytics website then you could extract it via the api. Just remember Google analytics data is not linked to a specific user in a way that you can see it.
There is no dimension for Clietid or userid. So unless you are sending a custom dimension with every hit with your internal user id your not going to be
able to see this information.
I recommend the google api php clinet library if you would like to try to do this with php.
// Create the DateRange object.
$dateRange = new Google_Service_AnalyticsReporting_DateRange();
$dateRange->setStartDate("2015-06-15");
$dateRange->setEndDate("2015-06-30");
// Create the Metrics object.
$sessions = new Google_Service_AnalyticsReporting_Metric();
$sessions->setExpression("ga:sessions");
$sessions->setAlias("sessions");
//Create the Dimensions object.
$browser = new Google_Service_AnalyticsReporting_Dimension();
$browser->setName("ga:browser");
// Create the ReportRequest object.
$request = new Google_Service_AnalyticsReporting_ReportRequest();
$request->setViewId("XXXX");
$request->setDateRanges($dateRange);
$request->setDimensions(array($browser));
$request->setMetrics(array($sessions));
$body = new Google_Service_AnalyticsReporting_GetReportsRequest();
$body->setReportRequests( array( $request) );
return $analyticsreporting->reports->batchGet( $body );