Complex sentence: Ivory and bone atlatl hooks of Clovis age have been archaeologically recovered; known bone and ivory tools associated with Clovis archaeological deposits are not considered effective foreshafts for projectile weapons.
Split into simpler sentences: Ivory and bone atlatl hooks of Clovis age have been archaeologically recovered. Known bone and ivory tools associated with Clovis archaeological deposits are not considered effective foreshafts for projectile weapons.