Complex sentence: In his introduction in the film "Stargate", Daniel first appears speaking at an academic seminar, where he finds little acceptance of his theory that the Pyramids of Giza were much older than they were thought to be.
Split into simpler sentences: In his introduction in the film "Stargate", the character of Daniel is introduced in a scene in which he is presenting a lecture at an academic seminar. However, he finds little acceptance there of his theory that the Pyramids of Giza are much older than they are thought to be.