Complex sentence: It has been the largest political group in the European Parliament since 1999; in the European Council 14 out of 28 Heads of State and Government belong to the EPP family; and in the European Commission 13 out of 28 Commissioners come from EPP parties.
Split into simpler sentences: It has been the largest political group in the European Parliament since 1999. In the European Council, 14 out of 28 Heads of State and Government belong to the EPP family and in the European Commission, 13 out of 28 Commissioners come from EPP parties.