Complex sentence: The Smart Common Input Method platform (SCIM) is an input method (IM) platform containing support for more than thirty languages (CJK and many European languages) for POSIX-style operating systems including Linux and BSD.
Split into simpler sentences: The Smart Common Input Method (SCIM) is a platform for inputting more than thirty languages on computers, including Chinese-Japanese-Korean style character languages (CJK), and many European languages. Currently it is used for POSIX-style operating systems including Linux and BSD.