Complex sentence: PHP has a direct module interface called Server Application Programming Interface (SAPI), which is supported by many web servers including Apache HTTP Server, Microsoft IIS, Netscape (now defunct) and iPlanet.
Split into simpler sentences: PHP has a direct module interface, supported by many web servers, called the Server Application Programming Interface (SAPI). These web servers include Apache HTTP Server, Microsoft IIS, Netscape (now defunct) and iPlanet.