question: product description and specifications are based on information sites of manufacturers. supplied specifications and appearance lawnmowers cougar bc-34 are subject to change without notice.
Capitalize this past sentence correctly.
A: Product description and specifications are based on information sites of manufacturers. Supplied specifications and appearance lawnmowers COUGAR BC-34 are subject to change without notice.

question: putin & i discussed forming an impenetrable cyber security unit so that election hacking, & many other negative things, will be guarded..
Capitalize this past sentence correctly.
A: Putin & I discussed forming an impenetrable Cyber Security unit so that election hacking, & many other negative things, will be guarded..

question: hopefully the band will grow before next (and last) brunch next sunday.
Capitalize this past sentence correctly.
A: Hopefully the band will grow before next (and last) brunch next Sunday.