Linux : transform blocks of X lines string into 1 line string - linux

Question

I have in my PHP file this string :
$sql = "SELECT p.pac_rut a, ";
$sql .= " p.pac_dig b, ";
$sql .= " p.pac_apepat c, ";
$sql .= " p.pac_apemat d, ";
$sql .= " p.pac_nombre e, ";
$sql .= " to_char(p.pac_fecha_nac,'dd/mm/yyyy') as f, ";
$sql .= " (to_char(sysdate,'yyyy')-to_char(p.pac_fecha_nac,'yyyy')) as g, ";
$sql .= " p.sex_cod h ";
$sql .= "FROM mytable ";
$sql .= "WHERE p.pac_rut=$rut";
And sed ':a;N;$!ba;s/\n//g' | sed 's/"; $sql .= "//g' | sed 's/ //g' | sed 's/=\$/=:/g' gives me the result ok like : $sql= "SELECT p.pac_rut a,p.pac_dig b,p.pac_apepat c,p.pac_apemat d,p.pac_nombre e,to_char(p.pac_fecha_nac,'dd/mm/yyyy') as f,(to_char(sysdate,'yyyy')-to_char(p.pac_fecha_nac,'yyyy')) as g,p.sex_cod h FROM salud.pacientes p WHERE p.pac_rut=:rut";
But if a have 2 (or more) blocks of sql queries, i need a function which can build 2 (or more) queries sql on 2 (or more) lines.
For ejample, i have :
$sql = "SELECT p.pac_rut a ";
$sql .= "FROM mytable ";
$sql .= "WHERE p.pac_rut=$rut";
and
$sql2 = "SELECT p.pac_rut a ";
$sql2 .= "FROM mytable ";
$sql2 .= "WHERE p.pac_rut=$rut";
in the same file, i need this result :
$sql = "SELECT p.pac_rut a FROM mytable WHERE p.pac_rut=$rut";
$sql2 = "SELECT p.pac_rut a FROM mytable WHERE p.pac_rut=$rut";
How can i do that with awk or sed or other linux tool ?