Too much punctuation can be confusing and tiring to read. If your sentences have an overload of commas, dashes, colons, and semi-colons, try re-phrasing and cutting longer sentences into 2 or 3 shorter sentences.

Most sentences that include items separated by punctuation can be more effectively shown on the Web as lists.

Compare the following examples:

Example 1

The supervising training organisation is obliged to work with the business or employer - and the apprentice - to design a training plan, including the training that needs to occur, how and when that training will take place, who will provide the training, and how that training will be assessed.

Example 2

The supervising training organisation works with employers and apprentices to design a training plan. This training plan includes details of: training requirements, training delivery, and assessment.

Active vs Passive Sentences in Web Writing Syllables and Rhythm in Web Writing

Related:
Using MS Word Readability Statistics for Web Writing