Pleas immediately suspend your practice with respect to your point 2, above.
There is no need for elaborate constructions like:
- 1912 - William Mervyn, who would play Sir Charles Summer in TV: The War Machines, was born in Nairobi, Kenya.
- 1920 - Peter Stephens, who would play Cyril and the Knave of Hearts in TV: The Celestial Toymaker and Lolem in TV: The Underwater Menace) was born.
As partially explained on your talk page, these articles should be wholly in the past tense. None of this conditional nonsense. Actually, we don't need the dependent clauses at all. This is a wiki. If people don't know who William Mervyn is, they can just click the links. We want them to click the links. The construction should simply be:
- 1912 - William Mervyn was born.
Done.
These are articles about days of the week, not about the people born on those dates. Birth and death information — indeed all BTS info — should be as minimal as possible.