"have further made" is a grammatically correct phrase and can be used in written English.
It is typically used to indicate that something has been done in addition to something else. Example: The researchers have further made improvements to the experiment design in order to ensure more accurate results.
Lack of historical yield data, small sized farm holdings, low value crops and the relatively high cost of insurance, have further made it more difficult to design, a workable crop insurance scheme (Rao K N).
In an attempt to minimise the presence of factors known to influence risks and therefore NNTs, we have selected rather homogeneous studies in terms of minimum follow-up, diagnostic criteria and have further made subgroup analyses accounting for several important clinical characteristics.
The Court has further made clear that an oath need not parrot the exact language of the constitutional oaths to be constitutionally proper.
The increasing cross-pollination of concepts from different comics cultures and eras has further made defining the medium difficult.
Convenience has further made child labor obsolete by simultaneously decreasing manual tasks in the home and infiltrating kids' brains, replacing responsibility with remote control.
While their style has always revolved around the irresistible, ever-changing pulse of Yukimi Nagano's singing, their varied, electronically-focused instrumentation, courtesy of Erik Bodin, Fredrik Källgren Wallin, Håkan Wirenstrand, has further made it tricky to pin the band down.
Unpredictable environment due to climate change has further made the task of breeders very difficult to improve these complex traits.
It has, further, made child rights an accessible topic by translating legal and theoretical discourse into interesting and practical activities.
But Vancouver Hospital, Canada's second-largest, has gone further, making the partnership official.
Minuscule by tradition, the science fiction market has contracted further, making it even more difficult for writers to find an audience.
These important made, and has further constrained the parameters in the Parameterized Post Newtonian formalism.
