Combine an array into a string with semicolon separator

$array = 'The','quick','brown','fox','jumps','over','the','lazy','dog.'
$array -join(';')

Details

Uses a join to combine the strings

Example

PS C:\> $array = 'The','quick','brown','fox','jumps','over','the','lazy','dog.'
>> $array -join(';')

The;quick;brown;fox;jumps;over;the;lazy;dog.