Add spaces: Itaccommodates4personsin1doublebedand1doublesofabed.

Answer: It accommodates 4 persons in 1 double bed and 1 double sofa bed.

Add spaces: YoucantrytakingabasicdietarysupplementcontainingB-vitamins;vitaminB5isparticularlyimportantinthiscontext.

Answer: You can try taking a basic dietary supplement containing B-vitamins; vitamin B5 is particularly important in this context.

Add spaces: BeforeyoucanopenaMTLfile,you'llneedtofigureoutwhatkindoffiletheMTLfileextensionrefersto.

Answer:
Before you can open a MTL file, you'll need to figure out what kind of file the MTL file extension refers to.