my @proc_requests = $schema->resultset( 'TblRequests' )->search({
                -or => [
                      status => 'Offered',
                      status => 'Denied',
                      status => 'Cancelled',
                      status => 'Conditional Offer',
                  ],
                    -and => [
                        -or => [
                                sent_email => {'!=', undef },
                                sent_email => {'!=', '0000-00-00'},
                         ],
                      ],
               },
               { prefetch => 'p' }
     );

##</code><code>##

my @proc_requests = $schema->resultset('TblRequests')->search(
    {
        -or => [
            status => 'Offered',
            status => 'Denied',
            status => 'Cancelled',
            status => 'Conditional Offer',
        ],
        -and => [
            -or => [
                sent_email => { '!=', undef },
                sent_email => { '!=', '0000-00-00' },
            ],
        ],
    },
    { prefetch => 'p' }
);

##</code><code>##

my @proc_requests = $schema->resultset('TblRequests')->search(
    {
        -or => [
            -or => [
                status => 'Offered',
                status => 'Denied',
                status => 'Cancelled',
                status => 'Conditional Offer',
            ],
            -and => [
                sent_email => { '!=', undef },
                sent_email => { '!=', '0000-00-00' },
            ],
        ],
    },
    { prefetch => 'p' }
);