Complex sentence: Siri (pronounced) is an intelligent personal assistant, part of Apple Inc. 's iOS, watchOS, macOS, and tvOS and a natural language user interface to answer questions, make recommendations, and perform actions by delegating requests to a set of Internet services.
Split into simpler sentences: Siri (pronounced) is an intelligent personal assistant, part of Apple Inc. 's iOS, watchOS, macOS, and tvOS operating systems. The assistant uses voice queries and a natural language user interface to answer questions, make recommendations, and perform actions by delegating requests to a set of Internet services.