The phrase "and which extend" is correct and usable in written English.
It can be used to introduce additional information about a subject, particularly when describing something that has a range or scope.
Example: "The new policies are designed to improve employee satisfaction and which extend to all departments within the organization."
Alternatives: "and that extend" or "and which reach".
Farther west are the Flemish polders (land reclaimed from the sea), which are seamed with drainage channels and which extend for 6 10 miles (10 16 km) inland.
Wilson has used this wisdom – "sociobiology" – to make arguments about genetics and conditioning that have applications thoughout the living world, and which extend to our understanding of human nature and society.
Crepuscular rays, shafts of light which are seen just after the sun has set and which extend over the western sky radiating from the position of the sun below the horizon.
There's a wistfulness underlying the plagiarism panic, a longing for the era of journalism before today's curation and aggregation sites, which appropriate at will and which extend reach at the expense of stature.
On the contrary, harnessed bees in the laboratory, which can be trained to associate a color with sucrose reward and which extend their proboscis to the learned color [43], have difficulties in learning this association and show very poor color discrimination abilities [44].
We observe that DIMM is generally expressed by those peptidergic cells that display the highest level of steady-state secretory activity and which extend longer and more complex neuronal processes we define these as Neurosecretory Neurons and give them the acronym LEAP, which stands for Large cells that display Episodic release of Amidated Peptides.
He also acted as consultant to the School Health Action and Training Project in Delhi, an NGO that he helped to establish and which extended its work into India's poorest areas.
Squeezed between the equatorial currents is a well-defined countercurrent, the axis of which is always north of the Equator and which extends from the Philippines to the shores of Ecuador.
"We will do our utmost to ensure the passing of a resolution that places the maximum pressure on the Libyan regime and which extends protection to the beleaguered and oppressed civilian population of Libya".
On September 20 , 2011 OPENLANE filed a supplemental proxy (the "Supplemental Proxy" or "Supp. Proxy") that mooted most of Treadway's disclosure claims, and which extended the deadline for stockholders to execute the Stockholder Acknowledgement to October 3, 2011.
His vast horizon reflected in part his concern with the French religious missions, which spread in Africa, the Middle East, and America and which extended French influence and created a vast intelligence network that fostered his political and economic designs.
