Ambiences that represent environments or landscapes play a crucial role in the soundtrack of a film when the geographic setting is important for the film’s narrative. When sound designers can encourage viewers to both notice and accept the environment displayed in the film, this can contribute to an immersive experience. Prior research has discussed how changes in the level of detail, or complexity, of ambiences and soundscapes can affect the perceived immersion of a film experience. This study aims to further investigate this topic by looking at how the complexity of a minor category of sound elements, environmental sounds, affects the immersiveness of a film scene. A listening/viewing test was conducted in a controlled studio environment where participants watched a video segment that was synced to two different versions of an environmental soundscape. One version was more complex than the other. All of the subjects watched and listened to the same video-soundscape combinations. Both quantitative and qualitative data were collected through an online questionnaire. The participants were asked to rate the video segments for immersion-related qualities and to motivate their ratings. The results did not show enough statistical significance to support the idea that a change in complexity affects all of the three qualities perceived presence, realism and how accurately the amount of sonic details matched the picture. However, the subjects’ motivations of their ratings for perceived presence and realism indicate that a detailed, layered soundscape that includes rarely occurring sound elements provides a stronger experience of presence and realism. Future research based on the findings from this study is presented.