Complex sentence: In geometry, a tetrahedral hyperprism is a convex uniform four dimensional polytope (or polychoron) composed from 6 polyhedral cells: 2 tetrahedra connected by 4 triangular prisms.
Split into simpler sentences: In geometry, a tetrahedral hyperprism is a convex uniform polychoron (four dimensional polytope). This polychoron has 6 polyhedral cells: 2 tetrahedra connected by 4 triangular prisms.