The ideal way to do this in HTML is to either use a hyphenation engine (many browsers support hyphenation natively when activated in CSS, for details please google, this is out of scope for this SE), or to manually include soft hyphen characters ­
in the HTML in long words.
Anwendungs­updates
The soft hyphen character is normally invisible, but the HTML engine will split the word with a hyphen if needed.
Resize your browser window to test it here:
Anwendungsupdates Anwendungsupdates Anwendungsupdates Anwendungsupdates Anwendungsupdates Anwendungsupdates Anwendungsupdates
To just split it into two words Anwendungs Updates is indeed incorrect in German. You could decompose it into something like "Updates für die Anwendung" but you should know what you're doing for this to fit the context.