Complex sentence: NIRCam is an instrument aboard the to-be-launched James Webb Space Telescope, and it has two major tasks, the first is an imager from 0.6 to 5 micron light wavelength and as wavefront sensor to keep the 18-section mirrors functioning as one.
Split into simpler sentences: NIRCam is an instrument aboard the to-be-launched James Webb Space Telescope. It has two major tasks, as an imager from 0.6 to 5 micron light wavelength, and as a wavefront sensor to keep the 18-section mirrors functioning as one.