Complex sentence: He gave the example of a hyphenation algorithm for a dictionary of 500,000 words, out of which 90% follow simple hyphenation rules; however, the remaining 10% require expensive disk accesses to retrieve specific hyphenation patterns.
Split into simpler sentences: He gave the example of a hyphenation algorithm for a dictionary of 500,000 words, of which 90% follow simple hyphenation rules. However, the remaining 10% require expensive disk access to retrieve specific hyphenation patterns.