Complex sentence: Despite the easy availability of miniature key loggers, tamper-evident design is not often used in personal computers, while transparent computer cases and keyboards are common, they are mainly used for decorative effect rather than security.
Split into simpler sentences: Despite the easy availability of miniature key loggers, tamper-evident design is not often used in personal computers. While transparent computer cases and keyboards are common, they are mainly used for decorative effect rather than security.