multiple table format through email using powershell

Hi All,

I have a powershell script which executes a SQL Query on three SQL instances and provides the result in table format through email. The output email contains all the result of the query in a single output itself. Please help me, I have provided the code which I am using

Sample output format which I am getting: 

ServerInstance DatabasenameEnabledStatus

Instance1Database1Enable

Instance1Database2Enable

Instance1Database3Enable

Instance2Database1   Enable

Instance2Database2Enable

My requirement is I should get two table formatted email like below:

Database status of Instance 1

ServerInstance DatabasenameEnabledStatus

Instance1Database1Enable

Instance1Database2Enable

Instance1Database3Enable

Database status of Instance 2

ServerInstance DatabasenameEnabledStatus

Instance2Database1   Enable

Instance2 Database2 Enable

#This PowerShell Scrip is well-suited with PowerShell V3.0
#import SQL Server module
#Import-Module SQLPS -DisableNameChecking 
#get all the instances and temporarily store them in a variable
$ServerInstances = Get-Content "C:\SQL_Servers.txt"
$scriptFile = "C:\restoredetails_mountdrive.sql"

$a = "Hi All, <BR> <BR>"
$a = $a + "Below is the TESTING Environment. This is an auto-generated mail.<BR><BR>"
$a = $a + "<style>"
$a = $a + "BODY{background-color:white;}"
$a = $a + "TABLE{border-width: 1px;border-style: solid;border-color: black;border-collapse: collapse;}"
$a = $a + "TH{border-width: 0px;width:150%;cellspacing=0 ;padding: 10px;border-style: solid;border-color: black;background-color:#43B2B2;font-family: Verdana;font-size:13 }"
$a = $a + "TD{border-width: 0px;width:150%;cellspacing=3 ;padding: 10px;border-style: solid;border-color: black;text-align: left;background-color:white;font-family: Verdana;font-size:11}"
$a = $a + "</style>" 
#he database we want to execute it against, regardless of the instance
$DBName = "master" 
#iterating through all instances.
$ServerInstances |
ForEach-Object {
#For each instance, we create a new SMO server object
$ServerObject = New-Object -TypeName Microsoft.SqlServer.Management.Smo.Server -ArgumentList $_
#use the Invoke-Sqlcmd cmdlet to execute the query
#we are passing in the pipeline is the instance name, which is $_
 $refresh_output1 = $refresh_output1 + (Invoke-Sqlcmd `
-ServerInstance $_ `
-Database $DBName `
-InputFile  $scriptFile
#-Query $SQLQuery
)

[string]$tst =   $refresh_output1 |convertTo-Html -Head $a -property InstanceName, DatabaseName,OverallStatus  | Out-String 

    write-output " " 
}

[System.Net.Mail.MailMessage]$message = New-Object System.Net.Mail.MailMessage("emailid.com", "toemailid.com", "Subject", $tst )

[System.Net.Mail.SmtpClient]$client = New-Object System.Net.Mail.SmtpClient("smtpserver",25)
$Message.IsBodyHtml = $true
$client.Timeout = 100

$client.Send($message)