Complex sentence: Before May 1929 had been bought near to Port Darlington by Thomas Richardson, and with others, such Joseph and Edward Pease, he formed the Owners of the Middlesborough Estate to develop it.
Split into simpler sentences: Before May 1929 had been bought near to Port Darlington by Thomas Richardson. With others, such Joseph and Edward Pease, he formed the Owners of the Middlesborough Estate to develop it.