You may use htql() function to separate them.  For example, if your HTML element is in a variable a, then use:
htql(a, '<td>:tx. /'',''/1 ./'' ''/1 ') to extract street;
htql(a, '<td>:tx. /'',''/1 ./'' ''/2 ') to extract town;
htql(a, '<td>:tx. /'',''/2 ./'' ''/1 ') to extract state;
htql(a, '<td>:tx. /'',''/2 ./'' ''/2 ') to extract zip.
 
Note that all the '' are two single quots.

The function is listed in the "Internal Functions: String Functions" section of the iRobot System Advanced Users' Guide.  
 
The detailed syntax of HTQL is in the "The Hyper-Text Query Language (HTQL) – A Web Programmer’s Guide" available at http://htql.net/.