Complex sentence: Most cytotoxic T cells express T-cell receptors (TcRs) that can recognise a specific antigenic peptide bound to Class I MHC molecules on an antigen presenting cell, and a glycoprotein called CD8, which is attracted to non-variable portions of the Class I MHC molecule.
Split into simpler sentences: Most cytotoxic T cells express T-cell receptors (TcRs) that can recognise a specific antigen peptide bound to Class I MHC molecules. These T C cells also express CD8, which is attracted to portions of the Class I MHC molecule.