Practise relative clauses with ‘Whose’, ‘Whom’, and ‘Where’ and make one sentence from two, as in this example:
Mr Green is very interested in our plan. I spoke to him last night.
Mr Green, to whom I spoke last night, is very interested in our plan.
Have a go yourself:
Mr Black wants to be included. I talked with him this morning.
Mrs White wants to do the baking. I discussed it with her last night.
Miss Scarlet wants to go ice skating. I saw her yesterday evening.
Colonel Mustard wants to go on a picnic. I spoke to him yesterday.