Complex sentence: Based in Baltimore Maryland, BSFS sponsors Balticon the Maryland Regional Science Fiction Convention, a young writers contest for Maryland students, maintains a free lending library and conducts other public outreach events promoting literacy.
Split into simpler sentences: Based in Baltimore, Maryland, the BSFS sponsors Balticon, the Maryland Regional Science Fiction Convention, and a young writers contest for Maryland students. It maintains a free lending library, and conducts other public outreach events promoting literacy.