fixing license

LICENSE

@@ -1,34 +1,30 @@
 Copyright (C) 2019-2023 The Simons Foundation, Inc., FMM3D Development Team 
 (see AUTHORS) - All Rights Reserved.
 
-FMM3D as a whole is licensed under the Apache License, Version 2.0 (the
-"License") only; or approach 'Exceptions'; 
-you may not use this file except in compliance with the
-License.  You may obtain a copy of the License at
-
+FMM3D as a whole is licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
     http://www.apache.org/licenses/LICENSE-2.0
-
+ 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-
-Exceptions
-===========
-The file "src/Common/dlaran.f" is licensed under the modified BSD license
-The files "src/Common/dfft.f", "src/Helmholtz/hwts3e.f", 
+
+This product bundles the file "src/Common/dlaran.f", which is available under a modified "3-Clause BSD" license. For details, see src/Common/dlaran.f.
+This product bundles the files "src/Common/dfft.f", "src/Helmholtz/hwts3e.f",
 "src/Helmholtz/hwts_3d_iprec0.txt",
-"src/Helmholtz/hwts_3d_iprec1.txt", 
-"src/Helmholtz/hwts_3d_iprec2.txt", 
-"src/Helmholtz/hwts_3d_iprec3.txt", 
-"src/Helmholtz/hwts_3d_iprec4.txt", 
-"src/Helmholtz/hnumfour.f", 
+"src/Helmholtz/hwts_3d_iprec1.txt",
+"src/Helmholtz/hwts_3d_iprec2.txt",
+"src/Helmholtz/hwts_3d_iprec3.txt",
+"src/Helmholtz/hwts_3d_iprec4.txt",
+"src/Helmholtz/hnumfour.f",
 "src/Helmholtz/hnumphys.f",
 "src/Laplace/lwtsexp_sep1.f", and
-"src/Laplace/lwtsexp_sep2.f" 
-are licensed under the public domain license.
-
+"src/Laplace/lwtsexp_sep2.f",
+which are available under the public domain. See each file for details.
 
 References
 ===========