Complex sentence: Citizens must be at least 16 years of age to vote: suffrage is universal and compulsory for literate persons aged 18 to 65 and optional for 16 and 17 years of age and other eligible voters.
Split into simpler sentences: Citizens must be at least 16 years of age to vote. Suffrage is universal and compulsory for literate persons ages 18--65 and optional for 16 and 17 years of age and other eligible voters.