Complex sentence: Spyglass created and marketed a commercially supported web server for Unix and Windows NT, variously called Spyglass Server and Server SDK, was announced in March 1995 and became available in July 1995.
Split into simpler sentences: Spyglass created and marketed a commercially supported web server for Unix and Windows NT, variously called Spyglass Server and Server SDK. The product was announced in March 1995 and became available in July 1995.