Complex sentence: Daou is known as an astronomer at NASA Headquarters in Washington, D.C., who is knowledgeable in grant proposals and as the creator and producer of the Ask an Astronomer video podcast.
Split into simpler sentences: Daou is known at NASA Headquarters in Washington, D.C., as an astronomer who is knowledgeable in grant proposals. She is the creator and producer of the Ask an Astronomer video podcast.