Please capitalize where necessary: wordpress plugin that combines the power of jquery masonry library programming and programming apis youtube. once installed, this plugin will allow you to highlight your youtube videos in the pop-up.
A: WordPress plugin that combines the power of jQuery Masonry library programming and programming APIs Youtube. Once installed, this plugin will allow you to highlight your YouTube videos in the pop-up.

Please capitalize where necessary: these were difficult times ....
A: These were difficult times ....

Please capitalize where necessary: the sculpturer wilhelm rasmussen has made this impressive menhir, 9 meters tall with a relief.
A: The sculpturer Wilhelm Rasmussen has made this impressive menhir, 9 meters tall with a relief.

Please capitalize where necessary: peculiar to early spanish (as in the gascon dialect of occitan, and possibly due to a basque substratum) was the mutation of latin initial f- into h- whenever it was followed by a vowel that did not diphthongate.
A:
Peculiar to early Spanish (as in the Gascon dialect of Occitan, and possibly due to a Basque substratum) was the mutation of Latin initial f- into h- whenever it was followed by a vowel that did not diphthongate.