Punctuation: semi-colon
Instead of full stops
Semi-colons (;) are sometimes used instead of full stops, in cases where sentences are grammatically independent but the meaning is closely connected. Semi-colons are not nearly as common as full stops or commas.
- Some people work best in the mornings; others do better in the evenings.
- It is a fine idea; let us hope that it is going to work.
Commas are not usually possible in cases like these (see here).
In lists
Semi-colons can also be used to separate items in a list, particularly when these are grammatically complex.
- You may use the sports facilities on condition that your subscription is paid regularly; that you arrange for all necessary cleaning to be carried out; that you undertake to make good any damage; …
note
For commas in lists, (see here).