Metadata has character limits for both the title and description. If you exceed these limits then Google will not show the entire text. You can’t control where Google decides to crop your text so to it is best to stay within the following character limits:
For the title: 70 characters INCLUDING spaces.
For the description: 200 characters INCLUDING spaces.
SEO best practice at the time of writing indicates that a meta title could be a little longer if necessary, but 70 characters is still the safest option to ensure that your title is always displayed in full.
The meta description character limit is absolute as if you go over this Google will not display your entire description. However, keeping the character count to between 200-300 characters is the most ideal.